wimlib

Hi, I'm attempting to backup a virtual machine host (and yes I understand the pitfalls of backing up at a hypervisor level).

It appears that wimlib is backing up the whole VHDX without suitable deduplication, is there a setting to have it incrementally backup a very large file with small changes efficiently?

No, wimlib and the WIM file format only do deduplication of whole files. You can create a solid archive which *compresses* files together, but that will not help with multi-gigabyte files since the sliding window for the compression is only 64 MB.

No worries, for hypervisor backups I'll revert to borg or rsync then. Having block level dedup would be nice, but that's also probably outside of .wim spec I'm guessing.