The errors are roughly what I’d expect from an aborted backup. Mostly, the errors are about too much data that isn’t referenced, because the backup did not finish, so no snapshot was written.
If you haven’t finished the backup of your hard disk yet, run restic rebuild-index followed by a new backup. This will re-use already uploaded data. Then afterwards run restic prune to get rid of all the unnecessary data.
If you have already finished the backup, just run restic prune.