Options for incremental backup of virtual disks

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LinksysRouter
Posts: 2
Joined: Sun Oct 08, 2017 10:53 pm

Options for incremental backup of virtual disks

Post by LinksysRouter »

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?
synchronicity
Site Admin
Posts: 472
Joined: Sun Aug 02, 2015 10:31 pm

Re: Options for incremental backup of virtual disks

Post by synchronicity »

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.
LinksysRouter
Posts: 2
Joined: Sun Oct 08, 2017 10:53 pm

Re: Options for incremental backup of virtual disks

Post by LinksysRouter »

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.
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