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Why virtual machine images are excluded from Time Machine backups by default
Authored by: richard2 on Jul 16, '12 09:36:52AM

Parallels and VMware exclude their virtual machine images from Time Machine backups by default to prevent Time Machine from backing up gibibytes of duplicate data every time an image is changed in the slightest. This is arguably a deficiency in Time Machine, which is compounded by the archaic single-file image format used by Parallels and VMware.

I'd recommend that people who use virtual machines keep their images excluded from Time Machine backups, and backup their images separately using rsync-based backup software.



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Why virtual machine images are excluded from Time Machine backups by default
Authored by: Westside guy on Jul 16, '12 11:54:50AM

Yeah, it wouldn't take long to fill up even a multi-terabyte drive if a person were including their virtual machines in their Time Machine backups.

I only keep one backup copy of my VMs. I don't even bother with rsync - I just, every so often, manually drag a VM over to the backup disk (which creates a copy, obviously). Some VMs are only testbeds, so those don't get backed up at all.



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