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Message: <blockquote data-quote="MacInWin" data-source="post: 1850110" data-attributes="member: 396914"><p>I think TM looks at the most recent time the file was written to for backups. When you open a VM, even if you don't do anything but boot it and then shut it down, the state of the file is changed, which then triggers TM. And since the VM is one file, all compressed together, TM can't just move what changed, it has to move the whole file. You can exclude the TM backup, of course, and use an internal backup system from within the VM to make separate backups of the VM that are outside the file, but that seems just too much work for me. I let TM do what TM is good at, but moved my VM images off the internal drive to an external that is periodically cloned to a backup as a precaution.</p></blockquote><p></p>