As information. If you want to test HS on a remote (external) drive while keeping your current OS on your internal drive be sure to disconnect TM before doing this. Here is what can happen: You start up your Mac on the internal drive, then change the start up disc containing HS & reboot. Then later you change your startup disc back to the internal and boot up. At this time TM will do a FULL backup (not incremental) filling up the TM drive. Not sure why this happens. This happened to me and was also reported by MacLife magazine April 2018.

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Time Machine and external Drive warning

As information. If you want to test HS on a remote (external) drive while keeping your current OS on your internal drive be sure to disconnect TM before doing this. Here is what can happen: You start up your Mac on the internal drive, then change the start up disc containing HS & reboot. Then later you change your startup disc back to the internal and boot up. At this time TM will do a FULL backup (not incremental) filling up the TM drive. Not sure why this happens. This happened to me and was also reported by MacLife magazine April 2018.

Posted on Mar 13, 2018 7:09 AM

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Time Machine and external Drive warning

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