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Time Machine: How can 750GB backup space be not enough for a 250GB disk?

I have an external backup partition that has 300% of my system disk (750gb backup vs. 250gb disk). Time machine cannot make the backup. I read through other forums, that a backup partition with same space as the disk is enough. So, how can this be not enough?

MacBook Pro 13″, macOS 10.15

Posted on Sep 9, 2020 11:41 PM

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Posted on Sep 10, 2020 4:19 PM

Safe Boot, (holding Shift key down at startup), does the problem occur in Safe Mode?


Safe mode attempts to repair Disks & clears lots of caches & loads safe Drivers, & prevents loading of 3rd party extensions, so if Safe Mode works try again in regular boot.

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Sep 10, 2020 4:19 PM in response to tomg740

Safe Boot, (holding Shift key down at startup), does the problem occur in Safe Mode?


Safe mode attempts to repair Disks & clears lots of caches & loads safe Drivers, & prevents loading of 3rd party extensions, so if Safe Mode works try again in regular boot.

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Sep 26, 2020 12:50 AM in response to tomg740

finally i've tried it. for my one backup volume of 750gb this indeed worked. great thanks! But I have another volume with "only" 400gb for this 250gb disk. this didn't work even in safe boot mode. any more tipps, or do I need to reinvest to make this 400gb volume bigger?

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Time Machine: How can 750GB backup space be not enough for a 250GB disk?

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