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c8ff52339f
Every unattended update created another full config snapshot under config-backups (or next to the config dir) and nothing ever pruned old ones, so small root filesystems filled up within days (#1646, reported on the hardened-unit fallback path where snapshots land under the install dir). backup_existing now keeps the five newest snapshots and removes the rest after each successful copy. Contract-Neutral: installer config backup rotation; shell-only fix, no runtime contract