[sandgiant]

Curious how much you backup, which version of restic you're running and why you think the deduplication is borderline unacceptable. There were several major (orders of magnitudes) improvements made to pruning within the past ~1 year, that's why I'm interested.

[mattbee]

A straight upgrade, that I can do :) It's been running for years without one.

I was only edgy about it because when it takes 36h it blocks the next daily backup, and I wondered whether that was going to get worse (it hasn't).

[chibea]

The max-unused percentage feature is well worth it to 80/20 the prune process and only prune the data which is easiest to prune away (i.e. not try to remove small files big packs but focus on packs which have lots of garbage).

In general, there's an unavoidable trade-off between creating many small packs (harder on metadata throughout the system, inside restic and on the backing store but more efficient to prune) versus creating big packs which are more easy on the metadata but might create big repack cost.

I guess a bit more intelligent repacking could avoid some of that cost by packing stuff together that might be more likely to get pruned together.