- [X]`restic backup` can take a long time: stream output to logging somehow to keep track of what it's doing. Stop using `--json` for `backup`, generates way too much JSON log info.
- [ ]`restic backup` can result in `Warning: at least one source file could not be read\n: exit status 3`. This returns an error, but the backup itself seems to be all right.
- [X] exit code 3: https://restic.readthedocs.io/en/stable/040_backup.html likely to be a permission problem, perhaps ignoring instead of panicking as of now?
- [ ]`restic list locks` showed a dangling one; PID of already gone `restic` process. Why? Unable to reproduce?