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<blockquote data-quote="MacInWin" data-source="post: 1786058" data-attributes="member: 396914">Too little information to really know. What Mac? What version of macOS? Are you leaving TM running, active, but just disconnect the drive? If you are doing that, then what TM is doing is making temporary images on your internal drive until it gets the backup drive again. That's not really how you should do that. It may be that when you then connect another drive of exactly the same name (my assumption for that), then TM sees it and wants to use it. But the backups are not there, so the backup &quot;fails&quot; for lack of previous backups being there to add the temporary snapshots to it. So get us more information. Also look into something like Time Machine Scheduler or Time Machine Editor to put your backups on a longer interval and try to leave the TM drive attached so that when the interval arrives, TM can do the backup. I use TME and do backups twice daily, noon and midnight.</blockquote>

[QUOTE="MacInWin, post: 1786058, member: 396914"] Too little information to really know. What Mac? What version of macOS? Are you leaving TM running, active, but just disconnect the drive? If you are doing that, then what TM is doing is making temporary images on your internal drive until it gets the backup drive again. That's not really how you should do that. It may be that when you then connect another drive of exactly the same name (my assumption for that), then TM sees it and wants to use it. But the backups are not there, so the backup "fails" for lack of previous backups being there to add the temporary snapshots to it. So get us more information. Also look into something like Time Machine Scheduler or Time Machine Editor to put your backups on a longer interval and try to leave the TM drive attached so that when the interval arrives, TM can do the backup. I use TME and do backups twice daily, noon and midnight. [/QUOTE]

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