Should have as a requirement that it doesn't cache very much locally
The backup program I'm currently using stores a lot of data locally, as a cache:
at 10:54:48 ⇰ du -sh .cache/borg/ 54G .cache/borg/ ~ at 10:58:52 ⇰
That's a lot of space. It is, in fact, more than 10% of the total amount of storage on my laptop.
I want to add a requirement on Obnam that it doesn't cache a lot of data locally, and that the amount it caches isn't proportional to amount of data in the backup store on the server.