Question: Can you backup and restore borg's cache?

Have you checked borgbackup docs, FAQ, and open Github issues?

Yes

Is this a BUG / ISSUE report or a QUESTION?

QUESTION

Question

Is it safe (by safe I mean data corruption) to backup ~/.cache/borg/ to a separate location using rsync so that when I restore from borg's repo to another machine, I can place the cache in the ~/.cache/borg/ directory on that machine and not have to generate the cache first time it backups from that machine?

It somehow sounds that is more risky and more effort than just letting it recreate the cache if needed?

So this is unsafe? Should I close the issue?

Yes, guess that letting a cache recreate after deletion (or moving a setup to somewhere else) is the usual procedure and should always work.

Doing stuff like copying caches around is error prone (not just due to borg internals, but also to simple mistakes like accidentally messing up permissions while copying) and could lead to strange issues in some circumstances - even if it could be done safely when considering. So why risk it.