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Every backup writes vaultik-destination.txt at the destination root. While the local index holds snapshots stored there, 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 dropping incomplete snapshots, snapshot remove before looking on the destination. remote nuke deletes the marker last. The file:// backend never creates its destination directory, which 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