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A scheduled backup to an unreachable remote now skips (exit 0) instead of erroring, so cron stops logging a failure when the NAS or laptop is offline. Authentication and host-key failures still error loudly, so a genuinely broken backup isn't masked as offline.
The actual backup drops rsync -v for --info=stats1, so the logfile gets a per-run summary instead of every transferred file path. The dryrun stays verbose.
list and status no longer count the latest/ working directory as a snapshot.
Snapshot directories are now read-only beyond the top level (find -type d). Only directories are touched, never the hard-linked files, so permissions don't ripple across snapshots.
Previously-unchecked rotation steps (orphan cleanup, the latest/ touch, the read-only chmod) now warn instead of failing silently. The remote snapshot listing falls back to BSD stat when GNU stat isn't available.
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Refuse to run when REMOTE_PATH or MOUNTDIR is empty or non-absolute. A blank config value otherwise resolves the destination to the filesystem root, where rotation runs rm -rf and --delete.
Run the rotation cp/mv/rm as bare command names in remote mode, resolved by the remote PATH, instead of hardcoded /usr/bin paths that broke on remotes whose binaries live elsewhere. Resolve the real binary via command -v in local mode.
Pass rsync -R so each source is stored under its full path. Two includes sharing a basename (/usr/local/bin and /usr/bin) previously both mapped to latest/bin, and the second sync's --delete wiped the first. This changes the stored layout: /usr/local/bin now lives at latest/usr/local/bin instead of latest/bin. /home and /etc are unchanged.
Add rsync --numeric-ids so /etc and /home ownership survives a restore when the destination has a different passwd/group database.
Match mount points exactly via is_mounted() instead of a substring grep of /proc/mounts, so /media/backup no longer matches /media/backup2, paths compare literally, and mount points with spaces work.
Reject a retention count below 1, which previously still created one snapshot. Drop the grep "|| echo 0" that emitted a stray second line, assemble ssh options as arrays, and quote the RSYNC_RSH identity path.
Extract derive_paths() and is_mounted() as sourceable functions and add unit, rsync-flag, and gated remote-mode test suites. The suite now runs 36 tests, and shellcheck is clean across the script and tests.
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