I noticed that I accidentally backed up a few hundred GB of log files for a few months in old snapshots. I need to keep these snapshots, but delete the accidentally added log files from them. Is this possible?
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This is not possible, snapshots are immutable. They have to be, to ensure the integrity of backups.
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Related to a similar, recent, post on the subject…
One way you might be able to do this is to write a script to restore each snapshot, delete the relevant files, set the system clock to when that backup ran, and then do a new backup to a fresh snapshot ID.
Iterate through all the IDs until complete. Then you could delete the old repository ID and cleanup with prune -exhaustive.
Most chunks will already be in the backup storage so this is just about recreating snapshot metadata.
Obviously quite a bit involved but a suite of maintenance scripts to do this would be a worthwhile project IMO.
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