diff --git a/backend/package-lock.json b/backend/package-lock.json
index ba1712fd..099463dc 100644
--- a/backend/package-lock.json
+++ b/backend/package-lock.json
@@ -10,8 +10,6 @@
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       "license": "SEE LICENSE IN LICENSE",
       "dependencies": {
-        "@aws-sdk/client-ecr": "^3.1019.0",
-        "@aws-sdk/client-s3": "^3.1037.0",
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@@ -66,6 +64,10 @@
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         "typescript-eslint": "^8.0.0",
         "vitest": "^4.1.0"
+      },
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+        "@aws-sdk/client-s3": "^3.1037.0"
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+      "optional": true,
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+      "optional": true,
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+      "optional": true,
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+      "optional": true,
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+      "optional": true,
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+      "optional": true,
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+      "optional": true,
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+      "optional": true,
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+      "optional": true,
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+      "optional": true,
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+      "optional": true,
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+      "optional": true,
       "dependencies": {
         "@smithy/core": "^3.23.17",
         "@smithy/middleware-endpoint": "^4.4.32",
@@ -2205,6 +2290,7 @@
       "resolved": "https://registry.npmjs.org/@smithy/types/-/types-4.14.1.tgz",
       "integrity": "sha512-59b5HtSVrVR/eYNei3BUj3DCPKD/G7EtDDe7OEJE7i7FtQFugYo6MxbotS8mVJkLNVf8gYaAlEBwwtJ9HzhWSg==",
       "license": "Apache-2.0",
+      "optional": true,
       "dependencies": {
         "tslib": "^2.6.2"
       },
@@ -2217,6 +2303,7 @@
       "resolved": "https://registry.npmjs.org/@smithy/url-parser/-/url-parser-4.2.14.tgz",
       "integrity": "sha512-p06BiBigJ8bTA3MgnOfCtDUWnAMY0YfedO/GRpmc7p+wg3KW8vbXy1xwSu5ASy0wV7rRYtlfZOIKH4XqfhjSQQ==",
       "license": "Apache-2.0",
+      "optional": true,
       "dependencies": {
         "@smithy/querystring-parser": "^4.2.14",
         "@smithy/types": "^4.14.1",
@@ -2231,6 +2318,7 @@
       "resolved": "https://registry.npmjs.org/@smithy/util-base64/-/util-base64-4.3.2.tgz",
       "integrity": "sha512-XRH6b0H/5A3SgblmMa5ErXQ2XKhfbQB+Fm/oyLZ2O2kCUrwgg55bU0RekmzAhuwOjA9qdN5VU2BprOvGGUkOOQ==",
       "license": "Apache-2.0",
+      "optional": true,
       "dependencies": {
         "@smithy/util-buffer-from": "^4.2.2",
         "@smithy/util-utf8": "^4.2.2",
@@ -2245,6 +2333,7 @@
       "resolved": "https://registry.npmjs.org/@smithy/util-body-length-browser/-/util-body-length-browser-4.2.2.tgz",
       "integrity": "sha512-JKCrLNOup3OOgmzeaKQwi4ZCTWlYR5H4Gm1r2uTMVBXoemo1UEghk5vtMi1xSu2ymgKVGW631e2fp9/R610ZjQ==",
       "license": "Apache-2.0",
+      "optional": true,
       "dependencies": {
         "tslib": "^2.6.2"
       },
@@ -2257,6 +2346,7 @@
       "resolved": "https://registry.npmjs.org/@smithy/util-body-length-node/-/util-body-length-node-4.2.3.tgz",
       "integrity": "sha512-ZkJGvqBzMHVHE7r/hcuCxlTY8pQr1kMtdsVPs7ex4mMU+EAbcXppfo5NmyxMYi2XU49eqaz56j2gsk4dHHPG/g==",
       "license": "Apache-2.0",
+      "optional": true,
       "dependencies": {
         "tslib": "^2.6.2"
       },
@@ -2269,6 +2359,7 @@
       "resolved": "https://registry.npmjs.org/@smithy/util-buffer-from/-/util-buffer-from-4.2.2.tgz",
       "integrity": "sha512-FDXD7cvUoFWwN6vtQfEta540Y/YBe5JneK3SoZg9bThSoOAC/eGeYEua6RkBgKjGa/sz6Y+DuBZj3+YEY21y4Q==",
       "license": "Apache-2.0",
+      "optional": true,
       "dependencies": {
         "@smithy/is-array-buffer": "^4.2.2",
         "tslib": "^2.6.2"
@@ -2282,6 +2373,7 @@
       "resolved": "https://registry.npmjs.org/@smithy/util-config-provider/-/util-config-provider-4.2.2.tgz",
       "integrity": "sha512-dWU03V3XUprJwaUIFVv4iOnS1FC9HnMHDfUrlNDSh4315v0cWyaIErP8KiqGVbf5z+JupoVpNM7ZB3jFiTejvQ==",
       "license": "Apache-2.0",
+      "optional": true,
       "dependencies": {
         "tslib": "^2.6.2"
       },
@@ -2294,6 +2386,7 @@
       "resolved": "https://registry.npmjs.org/@smithy/util-defaults-mode-browser/-/util-defaults-mode-browser-4.3.49.tgz",
       "integrity": "sha512-a5bNrdiONYB/qE2BuKegvUMd/+ZDwdg4vsNuuSzYE8qs2EYAdK9CynL+Rzn29PbPiUqoz/cbpRbcLzD5lEevHw==",
       "license": "Apache-2.0",
+      "optional": true,
       "dependencies": {
         "@smithy/property-provider": "^4.2.14",
         "@smithy/smithy-client": "^4.12.13",
@@ -2309,6 +2402,7 @@
       "resolved": "https://registry.npmjs.org/@smithy/util-defaults-mode-node/-/util-defaults-mode-node-4.2.54.tgz",
       "integrity": "sha512-g1cvrJvOnzeJgEdf7AE4luI7gp6L8weE0y9a9wQUSGtjb8QRHDbCJYuE4Sy0SD9N8RrnNPFsPltAz/OSoBR9Zw==",
       "license": "Apache-2.0",
+      "optional": true,
       "dependencies": {
         "@smithy/config-resolver": "^4.4.17",
         "@smithy/credential-provider-imds": "^4.2.14",
@@ -2327,6 +2421,7 @@
       "resolved": "https://registry.npmjs.org/@smithy/util-endpoints/-/util-endpoints-3.4.2.tgz",
       "integrity": "sha512-a55Tr+3OKld4TTtnT+RhKOQHyPxm3j/xL4OR83WBUhLJaKDS9dnJ7arRMOp3t31dcLhApwG9bgvrRXBHlLdIkg==",
       "license": "Apache-2.0",
+      "optional": true,
       "dependencies": {
         "@smithy/node-config-provider": "^4.3.14",
         "@smithy/types": "^4.14.1",
@@ -2341,6 +2436,7 @@
       "resolved": "https://registry.npmjs.org/@smithy/util-hex-encoding/-/util-hex-encoding-4.2.2.tgz",
       "integrity": "sha512-Qcz3W5vuHK4sLQdyT93k/rfrUwdJ8/HZ+nMUOyGdpeGA1Wxt65zYwi3oEl9kOM+RswvYq90fzkNDahPS8K0OIg==",
       "license": "Apache-2.0",
+      "optional": true,
       "dependencies": {
         "tslib": "^2.6.2"
       },
@@ -2353,6 +2449,7 @@
       "resolved": "https://registry.npmjs.org/@smithy/util-middleware/-/util-middleware-4.2.14.tgz",
       "integrity": "sha512-1Su2vj9RYNDEv/V+2E+jXkkwGsgR7dc4sfHn9Z7ruzQHJIEni9zzw5CauvRXlFJfmgcqYP8fWa0dkh2Q2YaQyw==",
       "license": "Apache-2.0",
+      "optional": true,
       "dependencies": {
         "@smithy/types": "^4.14.1",
         "tslib": "^2.6.2"
@@ -2366,6 +2463,7 @@
       "resolved": "https://registry.npmjs.org/@smithy/util-retry/-/util-retry-4.3.4.tgz",
       "integrity": "sha512-FY1UQQ1VFmMwiYp1GVS4MeaGD5O0blLNYK0xCRHU+mJgeoH/hSY8Ld8sJWKQ6uznkh14HveRGQJncgPyNl9J+A==",
       "license": "Apache-2.0",
+      "optional": true,
       "dependencies": {
         "@smithy/service-error-classification": "^4.3.0",
         "@smithy/types": "^4.14.1",
@@ -2380,6 +2478,7 @@
       "resolved": "https://registry.npmjs.org/@smithy/util-stream/-/util-stream-4.5.25.tgz",
       "integrity": "sha512-/PFpG4k8Ze8Ei+mMKj3oiPICYekthuzePZMgZbCqMiXIHHf4n2aZ4Ps0aSRShycFTGuj/J6XldmC0x0DwednIA==",
       "license": "Apache-2.0",
+      "optional": true,
       "dependencies": {
         "@smithy/fetch-http-handler": "^5.3.17",
         "@smithy/node-http-handler": "^4.6.1",
@@ -2399,6 +2498,7 @@
       "resolved": "https://registry.npmjs.org/@smithy/util-uri-escape/-/util-uri-escape-4.2.2.tgz",
       "integrity": "sha512-2kAStBlvq+lTXHyAZYfJRb/DfS3rsinLiwb+69SstC9Vb0s9vNWkRwpnj918Pfi85mzi42sOqdV72OLxWAISnw==",
       "license": "Apache-2.0",
+      "optional": true,
       "dependencies": {
         "tslib": "^2.6.2"
       },
@@ -2411,6 +2511,7 @@
       "resolved": "https://registry.npmjs.org/@smithy/util-utf8/-/util-utf8-4.2.2.tgz",
       "integrity": "sha512-75MeYpjdWRe8M5E3AW0O4Cx3UadweS+cwdXjwYGBW5h/gxxnbeZ877sLPX/ZJA9GVTlL/qG0dXP29JWFCD1Ayw==",
       "license": "Apache-2.0",
+      "optional": true,
       "dependencies": {
         "@smithy/util-buffer-from": "^4.2.2",
         "tslib": "^2.6.2"
@@ -2424,6 +2525,7 @@
       "resolved": "https://registry.npmjs.org/@smithy/util-waiter/-/util-waiter-4.2.16.tgz",
       "integrity": "sha512-GtclrKoZ3Lt7jPQ7aTIYKfjY92OgceScftVnkTsG8e1KV8rkvZgN+ny6YSRhd9hxB8rZtwVbmln7NTvE5O3GmQ==",
       "license": "Apache-2.0",
+      "optional": true,
       "dependencies": {
         "@smithy/types": "^4.14.1",
         "tslib": "^2.6.2"
@@ -2437,6 +2539,7 @@
       "resolved": "https://registry.npmjs.org/@smithy/uuid/-/uuid-1.1.2.tgz",
       "integrity": "sha512-O/IEdcCUKkubz60tFbGA7ceITTAJsty+lBjNoorP4Z6XRqaFb/OjQjZODophEcuq68nKm6/0r+6/lLQ+XVpk8g==",
       "license": "Apache-2.0",
+      "optional": true,
       "dependencies": {
         "tslib": "^2.6.2"
       },
@@ -3628,7 +3731,8 @@
       "version": "2.14.1",
       "resolved": "https://registry.npmjs.org/bowser/-/bowser-2.14.1.tgz",
       "integrity": "sha512-tzPjzCxygAKWFOJP011oxFHs57HzIhOEracIgAePE4pqB3LikALKnSzUyU4MGs9/iCEUuHlAJTjTc5M+u7YEGg==",
-      "license": "MIT"
+      "license": "MIT",
+      "optional": true
     },
     "node_modules/brace-expansion": {
       "version": "5.0.5",
@@ -4825,6 +4929,7 @@
         }
       ],
       "license": "MIT",
+      "optional": true,
       "dependencies": {
         "path-expression-matcher": "^1.1.3"
       }
@@ -4840,6 +4945,7 @@
         }
       ],
       "license": "MIT",
+      "optional": true,
       "dependencies": {
         "@nodable/entities": "^2.1.0",
         "fast-xml-builder": "^1.1.5",
@@ -6562,6 +6668,7 @@
         }
       ],
       "license": "MIT",
+      "optional": true,
       "engines": {
         "node": ">=14.0.0"
       }
@@ -7354,7 +7461,8 @@
           "url": "https://github.com/sponsors/NaturalIntelligence"
         }
       ],
-      "license": "MIT"
+      "license": "MIT",
+      "optional": true
     },
     "node_modules/superagent": {
       "version": "10.3.0",
@@ -7670,7 +7778,8 @@
       "version": "2.8.1",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
       "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
-      "license": "0BSD"
+      "license": "0BSD",
+      "optional": true
     },
     "node_modules/tunnel-agent": {
       "version": "0.6.0",
diff --git a/backend/package.json b/backend/package.json
index 49a89d7b..bbb30793 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -45,9 +45,11 @@
     "typescript-eslint": "^8.0.0",
     "vitest": "^4.1.0"
   },
-  "dependencies": {
+  "optionalDependencies": {
     "@aws-sdk/client-ecr": "^3.1019.0",
-    "@aws-sdk/client-s3": "^3.1037.0",
+    "@aws-sdk/client-s3": "^3.1037.0"
+  },
+  "dependencies": {
     "axios": "^1.15.0",
     "bcrypt": "^6.0.0",
     "better-sqlite3": "^12.6.2",
diff --git a/backend/src/services/CloudBackupService.ts b/backend/src/services/CloudBackupService.ts
index 70ac7e37..e8eacd61 100644
--- a/backend/src/services/CloudBackupService.ts
+++ b/backend/src/services/CloudBackupService.ts
@@ -24,7 +24,10 @@ import { isDebugEnabled } from '../utils/debug';
 // Cloud backup is opt-in (Skipper+ feature) and the AWS SDK v3 client pulls
 // in dozens of @smithy/* and @aws-sdk/middleware-* packages, so installs
 // without cloud backup configured pay a real boot-parse cost they never use.
-// Lazy-load the SDK on first call and cache it for subsequent requests.
+// The package is declared as an optionalDependency: present in the default
+// install, but operators who never touch cloud backup can run
+// `npm ci --omit=optional` for a slimmer image. Lazy-load the SDK on first
+// call and surface a clear error if it has been opt-out-pruned.
 type S3Sdk = typeof import('@aws-sdk/client-s3');
 type S3Client = InstanceType<S3Sdk['S3Client']>;
 
@@ -32,7 +35,17 @@ let cachedS3Sdk: S3Sdk | undefined;
 
 async function loadS3Sdk(): Promise<S3Sdk> {
     if (!cachedS3Sdk) {
-        cachedS3Sdk = await import('@aws-sdk/client-s3');
+        try {
+            cachedS3Sdk = await import('@aws-sdk/client-s3');
+        } catch (err) {
+            throw new Error(
+                'Cloud backup requires the @aws-sdk/client-s3 package. ' +
+                'It is shipped by default; if you built this image with ' +
+                '`npm ci --omit=optional`, reinstall without that flag to ' +
+                'enable cloud backup.',
+                { cause: err },
+            );
+        }
     }
     return cachedS3Sdk;
 }
diff --git a/backend/src/services/RegistryService.ts b/backend/src/services/RegistryService.ts
index 6576aee9..6db2686c 100644
--- a/backend/src/services/RegistryService.ts
+++ b/backend/src/services/RegistryService.ts
@@ -439,7 +439,23 @@ export class RegistryService {
         secretAccessKey: string,
         region: string,
     ): Promise<EcrCacheEntry> {
-        const { ECRClient, GetAuthorizationTokenCommand } = await import('@aws-sdk/client-ecr');
+        // @aws-sdk/client-ecr is declared as an optionalDependency: shipped
+        // in the default install, but absent when the image was built with
+        // `npm ci --omit=optional`. Surface a clear error rather than the
+        // raw "Cannot find module" so operators know how to recover.
+        let sdk: typeof import('@aws-sdk/client-ecr');
+        try {
+            sdk = await import('@aws-sdk/client-ecr');
+        } catch (err) {
+            throw new Error(
+                'ECR registry support requires the @aws-sdk/client-ecr package. ' +
+                'It is shipped by default; if you built this image with ' +
+                '`npm ci --omit=optional`, reinstall without that flag to ' +
+                'enable ECR.',
+                { cause: err },
+            );
+        }
+        const { ECRClient, GetAuthorizationTokenCommand } = sdk;
         const client = new ECRClient({
             region,
             credentials: { accessKeyId, secretAccessKey },
diff --git a/backend/tsconfig.json b/backend/tsconfig.json
index d1b16aca..7a102071 100644
--- a/backend/tsconfig.json
+++ b/backend/tsconfig.json
@@ -1,8 +1,8 @@
 {
   "compilerOptions": {
-    "target": "ES2020",
+    "target": "ES2022",
     "module": "commonjs",
-    "lib": ["ES2020"],
+    "lib": ["ES2022"],
     "outDir": "./dist",
     "rootDir": "./src",
     "strict": true,