Forget - Removing backup snapshots

All backup space is finite, so rustic allows removing old snapshots. This can be done either manually (by specifying a snapshot ID to remove) or by using a policy that describes which snapshots to forget. For all remove operations, two commands need to be called in sequence: forget to remove snapshots, and prune to remove the remaining data that was referenced only by the removed snapshots. The latter can be automated with the --prune option of forget, which runs prune automatically if any snapshots were actually removed.

It is advisable to run rustic check after pruning, to make sure you are alerted, should the internal data structures of the repository be damaged. But note: If you run a backup parallel to this check command, the output may produce some warnings as check cannote distinguish whether it’s a running backup and OK or an aborted backup with left-overs.