Quote:
Originally Posted by dnanian
you could always disconnect the Time Machine volume to ensure that it doesn't back up when started up from the copy...
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Kind of hard to do if the TM volume happens to be on an internal drive (e.g. in a Mac Pro).
I consistently get a "can't find valid TM volume" error (something like that), or TM isn't yet scheduled to run, right after restarting my Mac mini with an external drive connected that contains a TM volume. Always gives me enough time to manually unmount it if I don't want it online.