[Borgbackup] round robin

[Thomas Waldmann]

> https://borgbackup.readthedocs.io/en/stable/quickstart.html
> 
> If "borg create" exits non-zero, "borg prune" is invoked anyway.
> Suppose "borg create" exits non-zero during a longer period, let's say
> a week or so, would "borg prune --keep-hourly 24" leave at least the
> last 24 hour backups intact?

Yes. And in case borg create did not manage to create a new archive, the
amount of archives did not grow, so the set of archive borg prune is
seeing does not change, so it won't delete anything that it had not
deleted before already.

> Or would it be better to invoke "borg prune" only after a zero exit of
> "borg create"?

That would be somehow cautious, but maybe does not matter.


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