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Refuse a backup destination an unplugged volume left empty (closes #239)
Every backup writes vaultik-destination.txt at the destination root.
While the local index holds snapshots, a destination without it is
not present: snapshot create refuses before writing, prune and
snapshot purge fail, and snapshot list and snapshot remove act as for
a destination that cannot be listed. snapshot create checks before it
drops incomplete snapshots, snapshot remove before it looks on the
destination. remote nuke deletes the marker last. The file:// backend
never creates its destination directory; that protects a directory on
a removable volume, not a mount point.

Tests back up into directories that exist; fixtures for a written
destination carry the marker.

Judgement call: the marker is rewritten on every backup.
Deviation: for the complexity limit, two blocks moved, unchanged, into
snapshotNamesToCreate and confirmRemoveSnapshot.

Model: opus-5-5
2026-10-14 01:58:22 +00:00
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