It would be nice to see kopia.io in the comparison. Kopia is a backup software based on the similar concepts as other modern apps (infinite increments, rolling

It would be nice to see kopia.io in the comparison. Kopia is a backup software based on the similar concepts as other modern apps (infinite increments, rolling-hash based deduplication, immutable blobs, encryption) but has some things going for it in addition, such as the support for a wide array of backends (including S3; I use it on my small Ceph cluster), repo synchronization ability (using the same array of backends), and the ability to do concurrent backups on the same repo - something borgbackup still misses. Actually the last bit is the reason I chose to go with it at all, and I have since not regretted it, though I have only recovered small trees from it beyond testing. It can do backing from multiple computers to same repository (with dedupping) at different times without a lengthy index rebuilding. You can do this also with an intermediate server if you want clients to have different credentials to the repository (this is also quite difficult with borgbackup), but I haven't set up that yet. I guess performance-wise it doesn't hurt it's written in Go, though I don't have good numbers on that because my backup storage is not the fastest available :). It's able to do concurrent access on S3 which helps a lot.