diff --git a/docs/release-control/v6/internal/subsystems/alerts.md b/docs/release-control/v6/internal/subsystems/alerts.md
index dcf85fb8e..dc4643e49 100644
--- a/docs/release-control/v6/internal/subsystems/alerts.md
+++ b/docs/release-control/v6/internal/subsystems/alerts.md
@@ -459,6 +459,24 @@ templates, threshold ignored-prefix input, and incident timeline notes must
 compose `FormTextarea` for label/id/help wiring and textarea chrome instead of
 recreating raw labelled `<textarea>` shells locally. Alert resource row/mobile
 note editors now follow the same primitive contract.
+The Recovery and Snapshot Age threshold sections expose exactly one Global
+Defaults surface: the always-live editor row (table layout) or card (card
+layout) that the shared resource table renders when global defaults are
+supplied. They must not add a synthetic read-only resource row mirroring the
+same record; a second surface invites edits that no override mutation path
+persists, which is how #1680's silently-dropped edits happened. Snapshot size
+thresholds belong to the Snapshot Age section, not Recovery, because
+`BackupAlertConfig` has no size dimension. The recovery-defaults records carry
+the normalized `warningSizeGiB` and `criticalSizeGiB` metric keys that the
+column editor resolves for the size columns, and the configuration snapshot
+layer must round-trip those fields: `applyAlertsConfigToSnapshot` and
+`buildAlertsConfigurationPayload` carry them between the UI snapshot and
+`/api/alerts/config` rather than stripping them. Guests in the VMs &
+Containers section order by display name (numeric-aware, case-insensitive)
+with vmid as tiebreaker, because the rows render the name and an invisible
+sort key reads as an unsorted list. Regression ownership is
+`frontend-modern/src/utils/__tests__/metricThresholds.test.ts` and
+`frontend-modern/src/features/alerts/thresholds/hooks/__tests__/useThresholdsRecoveryDefaultsState.test.tsx`.
 Guest metric canonical state remains resource-backed and therefore node-scoped
 for Proxmox guests, so node moves must not strand active alert state on the
 previous resource ID. When a guest metric alert survives a node move, alerts
diff --git a/docs/release-control/v6/internal/subsystems/frontend-primitives.md b/docs/release-control/v6/internal/subsystems/frontend-primitives.md
index 8debc2567..bd5cef47d 100644
--- a/docs/release-control/v6/internal/subsystems/frontend-primitives.md
+++ b/docs/release-control/v6/internal/subsystems/frontend-primitives.md
@@ -795,6 +795,13 @@ Alert configuration tables follow the same primitive boundary: the alerts
 owner supplies platform-specific threshold groups and filter catalog values,
 while the shared FilterBar owns the chip, reset, and "+ Filter" interaction
 shape so thresholds do not reintroduce page-local search/tab chrome.
+The shared alert resource table's global-defaults row and card are the single
+editing surface for a section's defaults. A section that supplies
+`globalDefaults` must not also inject a synthetic resource row that mirrors
+the same record; the table renders defaults once, in both desktop table and
+narrow card layouts, and per-section metric columns must resolve to metric
+keys the shared column normalizer produces so the defaults editor reads and
+writes the same record keys the section persists.
 Platform sub-routes that add native provider inventory must stay on the shared
 platform page and table primitives. The vSphere Networks surface routes through
 `/vmware/networks`, the shared platform tab model, the command palette
diff --git a/frontend-modern/browser-verification.json b/frontend-modern/browser-verification.json
index 7a4415158..85911fa23 100644
--- a/frontend-modern/browser-verification.json
+++ b/frontend-modern/browser-verification.json
@@ -1,86 +1,57 @@
 {
   "version": 1,
-  "base_sha": "ff97e3943c866ef062d743e6f1da136c13109a26",
-  "verified_at": "2026-08-06T09:05:33Z",
+  "base_sha": "711eed6d695e9008d7c633fbdf985a86d1e6aea9",
+  "verified_at": "2026-08-06T09:12:17Z",
   "result": "passed",
   "changed_paths": [
-    "frontend-modern/src/components/Workloads/guestRowModel.tsx",
-    "frontend-modern/src/features/docker/dockerContainerTableModel.ts",
-    "frontend-modern/src/features/proxmox/proxmoxHostTableModel.ts"
+    "frontend-modern/src/components/Alerts/ThresholdsTableProxmoxBackupsSection.tsx",
+    "frontend-modern/src/components/Alerts/ThresholdsTableProxmoxSnapshotsSection.tsx",
+    "frontend-modern/src/features/alerts/alertsConfigurationModel.ts",
+    "frontend-modern/src/features/alerts/thresholds/hooks/useThresholdsGuestData.ts",
+    "frontend-modern/src/features/alerts/thresholds/hooks/useThresholdsOverrideMutations.ts",
+    "frontend-modern/src/features/alerts/thresholds/hooks/useThresholdsRecoveryDefaultsState.ts",
+    "frontend-modern/src/features/alerts/thresholds/hooks/useThresholdsTableState.ts",
+    "frontend-modern/src/features/alerts/thresholds/tableTypes.ts",
+    "frontend-modern/src/utils/alertThresholdDefaults.ts"
   ],
   "content_sha256": {
-    "frontend-modern/src/components/Workloads/guestRowModel.tsx": "dc5b5c79a0ddeb71e38bf2f01fa386f1850dffcf7315d9f697b681ad729b64ca",
-    "frontend-modern/src/features/docker/dockerContainerTableModel.ts": "85b9cac933ab3f5a7aa08f54d5fbcfa1b6e15b24b461eb8c3bea8efbc4e5364f",
-    "frontend-modern/src/features/proxmox/proxmoxHostTableModel.ts": "63078dbcaa4ac8b86c94612a3deeb116a72db90b0cdb01a9c997044be2e1750b"
+    "frontend-modern/src/components/Alerts/ThresholdsTableProxmoxBackupsSection.tsx": "a5dfeb2bfcc356e23b9ff164ab88782fca74593d8b3e45efea7261d02153a109",
+    "frontend-modern/src/components/Alerts/ThresholdsTableProxmoxSnapshotsSection.tsx": "222d2d08ad618fadbd34d5089287c3923a79b172c582203eac7469295b50a97e",
+    "frontend-modern/src/features/alerts/alertsConfigurationModel.ts": "4db657570ac209a00c16652a4f07b3be442a406d245766371c07ca2d3d32a1cf",
+    "frontend-modern/src/features/alerts/thresholds/hooks/useThresholdsGuestData.ts": "d4584732f18e15316427e7b3a206978e2ca35d097028aee0e6ab2b11c34ee6f1",
+    "frontend-modern/src/features/alerts/thresholds/hooks/useThresholdsOverrideMutations.ts": "c285c93a1e3a12f8481e80a8e6778334722055dcd5b885291fb33bed7d4270b0",
+    "frontend-modern/src/features/alerts/thresholds/hooks/useThresholdsRecoveryDefaultsState.ts": "4a2deeb37740fe79b627df17abf25bba57f3048fc82a4bc34c7010b3c5058241",
+    "frontend-modern/src/features/alerts/thresholds/hooks/useThresholdsTableState.ts": "0178351e2848c42ad085fdbc24e9c84e5810a81d073805070e436d680277cc03",
+    "frontend-modern/src/features/alerts/thresholds/tableTypes.ts": "90c1910781527b16bbdd509b25a946202956a2616cceac287edb0cafca895c54",
+    "frontend-modern/src/utils/alertThresholdDefaults.ts": "f59d80d26290b0a4d021c4ca093f879659635048042bb374eb0173c0b8fa2691"
   },
   "routes": [
-    "/proxmox/overview",
-    "/proxmox/storage",
-    "/proxmox/replication",
-    "/proxmox/backups",
-    "/proxmox/ceph",
-    "/proxmox/mail",
-    "/docker/overview",
-    "/docker/images",
-    "/docker/storage",
-    "/docker/networks",
-    "/docker/swarm",
-    "/kubernetes/overview",
-    "/kubernetes/nodes",
-    "/kubernetes/workloads",
-    "/kubernetes/services",
-    "/kubernetes/storage",
-    "/kubernetes/configuration",
-    "/kubernetes/events",
-    "/truenas/overview",
-    "/truenas/storage",
-    "/truenas/services",
-    "/truenas/apps",
-    "/truenas/vms",
-    "/truenas/shares",
-    "/truenas/protection",
-    "/vmware/overview",
-    "/vmware/storage",
-    "/vmware/networks",
-    "/vmware/health",
-    "/vmware/activity",
-    "/standalone/machines",
-    "/standalone/availability"
+    "/alerts/thresholds/proxmox"
   ],
   "viewports": [
     {
-      "width": 1280,
-      "height": 820
+      "width": 1600,
+      "height": 900
     },
     {
-      "width": 768,
-      "height": 820
+      "width": 1000,
+      "height": 900
     },
     {
-      "width": 390,
-      "height": 820
-    },
-    {
-      "width": 320,
-      "height": 820
+      "width": 375,
+      "height": 812
     }
   ],
   "states": [
-    "populated mock inventory across every platform workflow",
-    "phone workload layout with identity, availability, CPU, and memory",
-    "similar Proxmox workload names with and without backup posture cues",
-    "small-tablet workload layout with disk restored",
-    "desktop workload and native platform tables with their full responsive column sets",
-    "deep platform navigation tabs selected at the end of horizontally scrollable tab strips"
+    "Recovery section expanded, desktop table layout at 1600px, single Global Defaults editor row",
+    "Recovery and Snapshot Age sections expanded in card layout at 1000px and 375px, single Global Defaults card each",
+    "Snapshot Age section with Warning/Critical Size (GiB) columns visible, factory Off state",
+    "VMs & Containers section expanded, guest cards sorted by display name within node group"
   ],
   "interactions": [
-    "navigated all 32 platform workflow routes and waited for their loaded tables",
-    "scrolled populated Proxmox workload groups at 320 and 390 pixels and visually compared similarly named rows",
-    "changed from phone to 768 pixel tablet width and confirmed the disk column returned without table overflow",
-    "verified Proxmox, Docker, and VMware tables after the final layout-mode change at 320, 390, 768, and 1280 pixels",
-    "measured document, table, and scroll-container widths and found no page-level or table-level horizontal overflow",
-    "confirmed Proxmox, Docker, Kubernetes, TrueNAS, VMware, and Machines share identical desktop content bounds",
-    "opened deep Mail Gateway, Swarm, Events, Protection, Activity, and Availability tabs and confirmed the active tab was fully visible",
-    "checked the affected desktop journeys after the final code change and found no browser console errors"
+    "Enabled snapshot Warning Size via Off overlay, sanitizer mirrored value to Critical Size, Save Changes persisted warningSizeGiB and criticalSizeGiB via PUT /api/alerts/config and GET returned them",
+    "Reloaded page and confirmed persisted snapshot size values load back into the editor",
+    "Toggled snapshot size metrics back Off and saved, GET confirmed sizes cleared",
+    "Expanded and collapsed Recovery, Snapshot Age, and VMs & Containers sections at all three viewports"
   ]
 }
diff --git a/frontend-modern/src/components/Alerts/ThresholdsTableProxmoxBackupsSection.tsx b/frontend-modern/src/components/Alerts/ThresholdsTableProxmoxBackupsSection.tsx
index 33f33aecc..744354a75 100644
--- a/frontend-modern/src/components/Alerts/ThresholdsTableProxmoxBackupsSection.tsx
+++ b/frontend-modern/src/components/Alerts/ThresholdsTableProxmoxBackupsSection.tsx
@@ -30,37 +30,17 @@ export function ThresholdsTableProxmoxBackupsSection(props: ThresholdsTableSecti
         <div ref={state.registerSection('backups')} class="scroll-mt-24">
           <ResourceTable
             title=""
-            resources={[
-              {
-                id: 'backups-defaults',
-                name: 'Global Defaults',
-                thresholds: state.backupDefaultsRecord(),
-                defaults: state.backupDefaultsRecord(),
-                editable: true,
-                editScope: 'backup',
-              },
-            ]}
-            columns={[
-              'Fresh Hours',
-              'Stale Hours',
-              'Warning Days',
-              'Critical Days',
-              'Warning Size (GiB)',
-              'Critical Size (GiB)',
-            ]}
+            columns={['Fresh Hours', 'Stale Hours', 'Warning Days', 'Critical Days']}
             activeAlerts={tableProps.activeAlerts}
-            emptyMessage=""
             onEdit={state.startEditing}
             onSaveEdit={state.saveEdit}
             onCancelEdit={state.cancelEdit}
             onRemoveOverride={state.removeOverride}
-            showOfflineAlertsColumn={true}
             editingId={state.editingId}
             editingThresholds={state.editingThresholds}
             setEditingThresholds={state.setEditingThresholds}
             editingNote={state.editingNote}
             setEditingNote={state.setEditingNote}
-            onBulkEdit={(ids) => state.handleBulkEdit(ids, ['Usage %'])}
             formatMetricValue={formatMetricValue}
             hasActiveAlert={state.hasActiveAlert}
             globalDefaults={state.backupDefaultsRecord()}
diff --git a/frontend-modern/src/components/Alerts/ThresholdsTableProxmoxSnapshotsSection.tsx b/frontend-modern/src/components/Alerts/ThresholdsTableProxmoxSnapshotsSection.tsx
index 0f245b8ac..fb25be7d1 100644
--- a/frontend-modern/src/components/Alerts/ThresholdsTableProxmoxSnapshotsSection.tsx
+++ b/frontend-modern/src/components/Alerts/ThresholdsTableProxmoxSnapshotsSection.tsx
@@ -23,30 +23,17 @@ export function ThresholdsTableProxmoxSnapshotsSection(props: ThresholdsTableSec
         <div ref={state.registerSection('snapshots')} class="scroll-mt-24">
           <ResourceTable
             title=""
-            resources={[
-              {
-                id: 'snapshots-defaults',
-                name: 'Global Defaults',
-                thresholds: state.snapshotDefaultsRecord(),
-                defaults: state.snapshotDefaultsRecord(),
-                editable: true,
-                editScope: 'snapshot',
-              },
-            ]}
-            columns={['Warning Days', 'Critical Days']}
+            columns={['Warning Days', 'Critical Days', 'Warning Size (GiB)', 'Critical Size (GiB)']}
             activeAlerts={tableProps.activeAlerts}
-            emptyMessage=""
             onEdit={state.startEditing}
             onSaveEdit={state.saveEdit}
             onCancelEdit={state.cancelEdit}
             onRemoveOverride={state.removeOverride}
-            showOfflineAlertsColumn={true}
             editingId={state.editingId}
             editingThresholds={state.editingThresholds}
             setEditingThresholds={state.setEditingThresholds}
             editingNote={state.editingNote}
             setEditingNote={state.setEditingNote}
-            onBulkEdit={(ids) => state.handleBulkEdit(ids, ['Usage %', 'Temperature °C'])}
             formatMetricValue={formatMetricValue}
             hasActiveAlert={state.hasActiveAlert}
             globalDefaults={state.snapshotDefaultsRecord()}
@@ -55,8 +42,8 @@ export function ThresholdsTableProxmoxSnapshotsSection(props: ThresholdsTableSec
                 const currentRecord = {
                   'warning days': prev.warningDays ?? 0,
                   'critical days': prev.criticalDays ?? 0,
-                  'warning size (gib)': prev.warningSizeGiB ?? 0,
-                  'critical size (gib)': prev.criticalSizeGiB ?? 0,
+                  warningSizeGiB: prev.warningSizeGiB ?? 0,
+                  criticalSizeGiB: prev.criticalSizeGiB ?? 0,
                 };
                 const nextRecord =
                   typeof value === 'function'
@@ -73,12 +60,12 @@ export function ThresholdsTableProxmoxSnapshotsSection(props: ThresholdsTableSec
                       ? nextRecord['critical days']
                       : prev.criticalDays,
                   warningSizeGiB:
-                    typeof nextRecord['warning size (gib)'] === 'number'
-                      ? nextRecord['warning size (gib)']
+                    typeof nextRecord.warningSizeGiB === 'number'
+                      ? nextRecord.warningSizeGiB
                       : prev.warningSizeGiB,
                   criticalSizeGiB:
-                    typeof nextRecord['critical size (gib)'] === 'number'
-                      ? nextRecord['critical size (gib)']
+                    typeof nextRecord.criticalSizeGiB === 'number'
+                      ? nextRecord.criticalSizeGiB
                       : prev.criticalSizeGiB,
                 };
               });
diff --git a/frontend-modern/src/features/alerts/alertsConfigurationModel.ts b/frontend-modern/src/features/alerts/alertsConfigurationModel.ts
index 6363feda9..3f141903c 100644
--- a/frontend-modern/src/features/alerts/alertsConfigurationModel.ts
+++ b/frontend-modern/src/features/alerts/alertsConfigurationModel.ts
@@ -549,10 +549,16 @@ export function readAlertsConfigurationSnapshot(config: AlertConfig): AlertsConf
       config.snapshotDefaults.warningDays,
       config.snapshotDefaults.criticalDays,
     );
+    const normalizedSizePair = normalizeWarningCriticalPair(
+      config.snapshotDefaults.warningSizeGiB,
+      config.snapshotDefaults.criticalSizeGiB,
+    );
     snapshot.snapshotDefaults = {
       enabled: Boolean(config.snapshotDefaults.enabled),
       warningDays: normalizedPair.warning,
       criticalDays: normalizedPair.critical,
+      warningSizeGiB: normalizedSizePair.warning,
+      criticalSizeGiB: normalizedSizePair.critical,
     };
   }
 
@@ -695,6 +701,10 @@ export function buildAlertsConfigurationPayload({
     snapshot.snapshotDefaults.warningDays,
     snapshot.snapshotDefaults.criticalDays,
   );
+  const normalizedSnapshotSizePair = normalizeWarningCriticalPair(
+    snapshot.snapshotDefaults.warningSizeGiB,
+    snapshot.snapshotDefaults.criticalSizeGiB,
+  );
   const normalizedBackupPair = normalizeWarningCriticalPair(
     snapshot.backupDefaults.warningDays,
     snapshot.backupDefaults.criticalDays,
@@ -830,6 +840,8 @@ export function buildAlertsConfigurationPayload({
         enabled: snapshot.snapshotDefaults.enabled,
         warningDays: normalizedSnapshotPair.warning,
         criticalDays: normalizedSnapshotPair.critical,
+        warningSizeGiB: normalizedSnapshotSizePair.warning,
+        criticalSizeGiB: normalizedSnapshotSizePair.critical,
       },
       backupDefaults: {
         enabled: snapshot.backupDefaults.enabled,
diff --git a/frontend-modern/src/features/alerts/thresholds/hooks/__tests__/truenasThresholdPersistence.test.tsx b/frontend-modern/src/features/alerts/thresholds/hooks/__tests__/truenasThresholdPersistence.test.tsx
index 8bef6d606..e6c6e5614 100644
--- a/frontend-modern/src/features/alerts/thresholds/hooks/__tests__/truenasThresholdPersistence.test.tsx
+++ b/frontend-modern/src/features/alerts/thresholds/hooks/__tests__/truenasThresholdPersistence.test.tsx
@@ -156,8 +156,6 @@ describe('TrueNAS threshold persistence identity', () => {
         editingNote,
         bulkEditIds,
         cancelEdit,
-        updateBackupDefaults: vi.fn(),
-        updateSnapshotDefaults: vi.fn(),
       }),
     );
 
@@ -289,8 +287,6 @@ describe('TrueNAS threshold persistence identity', () => {
         editingNote,
         bulkEditIds,
         cancelEdit,
-        updateBackupDefaults: vi.fn(),
-        updateSnapshotDefaults: vi.fn(),
       }),
     );
 
diff --git a/frontend-modern/src/features/alerts/thresholds/hooks/__tests__/useThresholdsOverrideMutations.test.tsx b/frontend-modern/src/features/alerts/thresholds/hooks/__tests__/useThresholdsOverrideMutations.test.tsx
index 8d384ee26..7555b77ce 100644
--- a/frontend-modern/src/features/alerts/thresholds/hooks/__tests__/useThresholdsOverrideMutations.test.tsx
+++ b/frontend-modern/src/features/alerts/thresholds/hooks/__tests__/useThresholdsOverrideMutations.test.tsx
@@ -86,8 +86,6 @@ describe('useThresholdsOverrideMutations', () => {
         editingNote,
         bulkEditIds,
         cancelEdit,
-        updateBackupDefaults: vi.fn(),
-        updateSnapshotDefaults: vi.fn(),
       }),
     );
 
@@ -150,8 +148,6 @@ describe('useThresholdsOverrideMutations', () => {
         editingNote: () => '',
         bulkEditIds: () => [filesystemResource.id],
         cancelEdit: vi.fn(),
-        updateBackupDefaults: vi.fn(),
-        updateSnapshotDefaults: vi.fn(),
       }),
     );
 
diff --git a/frontend-modern/src/features/alerts/thresholds/hooks/__tests__/useThresholdsRecoveryDefaultsState.test.tsx b/frontend-modern/src/features/alerts/thresholds/hooks/__tests__/useThresholdsRecoveryDefaultsState.test.tsx
index 16790f2de..1ef5bee7d 100644
--- a/frontend-modern/src/features/alerts/thresholds/hooks/__tests__/useThresholdsRecoveryDefaultsState.test.tsx
+++ b/frontend-modern/src/features/alerts/thresholds/hooks/__tests__/useThresholdsRecoveryDefaultsState.test.tsx
@@ -106,9 +106,9 @@ describe('useThresholdsRecoveryDefaultsState', () => {
     expect(captured).toBeDefined();
     expect(captured!.snapshotDefaultsRecord()).toEqual({
       'critical days': 10,
-      'critical size (gib)': 18,
+      criticalSizeGiB: 18,
       'warning days': 6,
-      'warning size (gib)': 12,
+      warningSizeGiB: 12,
     });
     expect(captured!.backupFactoryDefaultsRecord()).toEqual({
       'critical days': 7,
diff --git a/frontend-modern/src/features/alerts/thresholds/hooks/useThresholdsGuestData.ts b/frontend-modern/src/features/alerts/thresholds/hooks/useThresholdsGuestData.ts
index 86e59fb2a..96d39d060 100644
--- a/frontend-modern/src/features/alerts/thresholds/hooks/useThresholdsGuestData.ts
+++ b/frontend-modern/src/features/alerts/thresholds/hooks/useThresholdsGuestData.ts
@@ -87,10 +87,16 @@ export function useThresholdsGuestData(inputs: ThresholdsDataInputs) {
       grouped[groupKey].push(guest);
     });
 
+    // Sort by the name the row actually displays; vmid is not rendered here,
+    // so a vmid-first order reads as unsorted (#1680). vmid only breaks ties.
     Object.keys(grouped).forEach((node) => {
       grouped[node].sort((a, b) => {
-        if (a.vmid && b.vmid) return a.vmid - b.vmid;
-        return a.name.localeCompare(b.name);
+        const byName = a.name.localeCompare(b.name, undefined, {
+          numeric: true,
+          sensitivity: 'base',
+        });
+        if (byName !== 0) return byName;
+        return (a.vmid ?? 0) - (b.vmid ?? 0);
       });
     });
 
diff --git a/frontend-modern/src/features/alerts/thresholds/hooks/useThresholdsOverrideMutations.ts b/frontend-modern/src/features/alerts/thresholds/hooks/useThresholdsOverrideMutations.ts
index 518775281..27d2d34c0 100644
--- a/frontend-modern/src/features/alerts/thresholds/hooks/useThresholdsOverrideMutations.ts
+++ b/frontend-modern/src/features/alerts/thresholds/hooks/useThresholdsOverrideMutations.ts
@@ -1,14 +1,6 @@
 import type { Accessor } from 'solid-js';
 
-import type { RawOverrideConfig, BackupAlertConfig, SnapshotAlertConfig } from '@/types/alerts';
-import {
-  DEFAULT_SNAPSHOT_WARNING,
-  DEFAULT_SNAPSHOT_CRITICAL,
-  DEFAULT_SNAPSHOT_WARNING_SIZE,
-  DEFAULT_SNAPSHOT_CRITICAL_SIZE,
-  DEFAULT_BACKUP_WARNING,
-  DEFAULT_BACKUP_CRITICAL,
-} from '@/features/alerts/thresholds/constants';
+import type { RawOverrideConfig } from '@/types/alerts';
 import type {
   Override,
   OverrideType,
@@ -60,12 +52,6 @@ interface ThresholdsOverrideMutationProps {
   editingNote: Accessor<string>;
   bulkEditIds: Accessor<string[]>;
   cancelEdit: () => void;
-  updateBackupDefaults: (
-    updater: BackupAlertConfig | ((prev: BackupAlertConfig) => BackupAlertConfig),
-  ) => void;
-  updateSnapshotDefaults: (
-    updater: SnapshotAlertConfig | ((prev: SnapshotAlertConfig) => SnapshotAlertConfig),
-  ) => void;
 }
 
 export function useThresholdsOverrideMutations({
@@ -75,8 +61,6 @@ export function useThresholdsOverrideMutations({
   editingNote,
   bulkEditIds,
   cancelEdit,
-  updateBackupDefaults,
-  updateSnapshotDefaults,
 }: ThresholdsOverrideMutationProps) {
   const optionalResources = (accessor?: Accessor<TableResource[]>): TableResource[] =>
     accessor?.() ?? [];
@@ -126,48 +110,6 @@ export function useThresholdsOverrideMutations({
     const trimmedNote = editingNote().trim();
     const noteForOverride = trimmedNote.length > 0 ? trimmedNote : undefined;
 
-    if (resource.editScope === 'backup') {
-      const currentBackupDefaults = props.backupDefaults();
-      updateBackupDefaults({
-        criticalDays:
-          editedThresholdMap['critical days'] ??
-          currentBackupDefaults.criticalDays ??
-          DEFAULT_BACKUP_CRITICAL,
-        enabled: currentBackupDefaults.enabled,
-        warningDays:
-          editedThresholdMap['warning days'] ??
-          currentBackupDefaults.warningDays ??
-          DEFAULT_BACKUP_WARNING,
-      });
-      cancelEdit();
-      return;
-    }
-
-    if (resource.editScope === 'snapshot') {
-      const currentSnapshotDefaults = props.snapshotDefaults();
-      updateSnapshotDefaults({
-        criticalDays:
-          editedThresholdMap['critical days'] ??
-          currentSnapshotDefaults.criticalDays ??
-          DEFAULT_SNAPSHOT_CRITICAL,
-        criticalSizeGiB:
-          editedThresholdMap['critical size (gib)'] ??
-          currentSnapshotDefaults.criticalSizeGiB ??
-          DEFAULT_SNAPSHOT_CRITICAL_SIZE,
-        enabled: currentSnapshotDefaults.enabled,
-        warningDays:
-          editedThresholdMap['warning days'] ??
-          currentSnapshotDefaults.warningDays ??
-          DEFAULT_SNAPSHOT_WARNING,
-        warningSizeGiB:
-          editedThresholdMap['warning size (gib)'] ??
-          currentSnapshotDefaults.warningSizeGiB ??
-          DEFAULT_SNAPSHOT_WARNING_SIZE,
-      });
-      cancelEdit();
-      return;
-    }
-
     const defaultThresholds = (resource.defaults ?? {}) as Record<string, number | undefined>;
     const overrideThresholds: Record<string, number> = {};
 
diff --git a/frontend-modern/src/features/alerts/thresholds/hooks/useThresholdsRecoveryDefaultsState.ts b/frontend-modern/src/features/alerts/thresholds/hooks/useThresholdsRecoveryDefaultsState.ts
index 065b708fb..407ee1b8e 100644
--- a/frontend-modern/src/features/alerts/thresholds/hooks/useThresholdsRecoveryDefaultsState.ts
+++ b/frontend-modern/src/features/alerts/thresholds/hooks/useThresholdsRecoveryDefaultsState.ts
@@ -106,13 +106,16 @@ export function useThresholdsRecoveryDefaultsState(props: ThresholdsTableProps)
     };
   };
 
+  // Size keys use the normalized metric key ('warningSizeGiB'), matching what
+  // normalizeAlertResourceMetricKey resolves for the 'Warning Size (GiB)'
+  // column — the global-defaults editor reads and writes through that key.
   const snapshotDefaultsRecord = createMemo(() => {
     const current = props.snapshotDefaults();
     return {
       'warning days': current.warningDays ?? 0,
       'critical days': current.criticalDays ?? 0,
-      'warning size (gib)': current.warningSizeGiB ?? 0,
-      'critical size (gib)': current.criticalSizeGiB ?? 0,
+      warningSizeGiB: current.warningSizeGiB ?? 0,
+      criticalSizeGiB: current.criticalSizeGiB ?? 0,
     };
   });
 
@@ -121,8 +124,8 @@ export function useThresholdsRecoveryDefaultsState(props: ThresholdsTableProps)
     return {
       'warning days': factory.warningDays ?? DEFAULT_SNAPSHOT_WARNING,
       'critical days': factory.criticalDays ?? DEFAULT_SNAPSHOT_CRITICAL,
-      'warning size (gib)': factory.warningSizeGiB ?? DEFAULT_SNAPSHOT_WARNING_SIZE,
-      'critical size (gib)': factory.criticalSizeGiB ?? DEFAULT_SNAPSHOT_CRITICAL_SIZE,
+      warningSizeGiB: factory.warningSizeGiB ?? DEFAULT_SNAPSHOT_WARNING_SIZE,
+      criticalSizeGiB: factory.criticalSizeGiB ?? DEFAULT_SNAPSHOT_CRITICAL_SIZE,
     };
   });
 
diff --git a/frontend-modern/src/features/alerts/thresholds/hooks/useThresholdsTableState.ts b/frontend-modern/src/features/alerts/thresholds/hooks/useThresholdsTableState.ts
index dc3042d53..32bb0a200 100644
--- a/frontend-modern/src/features/alerts/thresholds/hooks/useThresholdsTableState.ts
+++ b/frontend-modern/src/features/alerts/thresholds/hooks/useThresholdsTableState.ts
@@ -738,8 +738,6 @@ export function useThresholdsTableState(props: ThresholdsTableProps) {
     editingNote,
     bulkEditIds,
     cancelEdit,
-    updateBackupDefaults,
-    updateSnapshotDefaults,
   });
 
   const { setOfflineState, toggleDisabled, toggleNodeConnectivity } =
diff --git a/frontend-modern/src/features/alerts/thresholds/tableTypes.ts b/frontend-modern/src/features/alerts/thresholds/tableTypes.ts
index 393506027..f003e6bb4 100644
--- a/frontend-modern/src/features/alerts/thresholds/tableTypes.ts
+++ b/frontend-modern/src/features/alerts/thresholds/tableTypes.ts
@@ -34,7 +34,6 @@ export interface Resource {
   clusterName?: string;
   isClusterMember?: boolean;
   delaySeconds?: number;
-  editScope?: 'snapshot' | 'backup';
   isEnabled?: boolean;
   toggleEnabled?: () => void;
   toggleTitleEnabled?: string;
diff --git a/frontend-modern/src/utils/__tests__/metricThresholds.test.ts b/frontend-modern/src/utils/__tests__/metricThresholds.test.ts
index 6fd222197..ecddd44a2 100644
--- a/frontend-modern/src/utils/__tests__/metricThresholds.test.ts
+++ b/frontend-modern/src/utils/__tests__/metricThresholds.test.ts
@@ -14,6 +14,7 @@ import {
 } from '@/utils/metricThresholds';
 import {
   FACTORY_KUBERNETES_DEFAULTS,
+  FACTORY_SNAPSHOT_DEFAULTS,
   FACTORY_TRUENAS_DEFAULTS,
   FACTORY_TRUENAS_DISK_DEFAULTS,
   FACTORY_VMWARE_DEFAULTS,
@@ -408,6 +409,19 @@ describe('metricThresholds', () => {
       });
     });
 
+    it('keeps snapshot factory defaults carrying size thresholds disabled at zero', () => {
+      // The size pair must exist on the factory config so the thresholds
+      // editor and the save payload round-trip them; 0 means size-based
+      // snapshot alerts are off until an operator enables them.
+      expect(FACTORY_SNAPSHOT_DEFAULTS).toEqual({
+        enabled: false,
+        warningDays: 30,
+        criticalDays: 45,
+        warningSizeGiB: 0,
+        criticalSizeGiB: 0,
+      });
+    });
+
     it('keeps Kubernetes, TrueNAS, and vSphere factory defaults explicit for alert configuration', () => {
       expect(FACTORY_KUBERNETES_DEFAULTS).toEqual({
         cpu: 80,
diff --git a/frontend-modern/src/utils/alertThresholdDefaults.ts b/frontend-modern/src/utils/alertThresholdDefaults.ts
index 4354885d5..fa83e6614 100644
--- a/frontend-modern/src/utils/alertThresholdDefaults.ts
+++ b/frontend-modern/src/utils/alertThresholdDefaults.ts
@@ -95,6 +95,9 @@ export const FACTORY_SNAPSHOT_DEFAULTS: SnapshotAlertConfig = {
   enabled: false,
   warningDays: 30,
   criticalDays: 45,
+  // 0 disables size-based snapshot alerts; the engine only fires on sizes > 0.
+  warningSizeGiB: 0,
+  criticalSizeGiB: 0,
 };
 
 export const FACTORY_BACKUP_DEFAULTS: BackupAlertConfig = {