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HD has 60% free space. Backup has 3% free space

The internal HD on my iMac is 1 TB. time machine is supporting my backup on a 1 TB western digital. Why does my backup only have 3% free space left when my internal HD has 60% left? wouldn't it be the same? Does this have to do with time machine? i'm pretty limited on my understanding of how stuff works.


Mountain Lion 10.8.5

iMac early 2009


Backup: Western Digital

My Passport Ultra 1 TB

iMac, OS X Mountain Lion (10.8.5)

Posted on Oct 3, 2015 9:20 AM

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Posted on Oct 3, 2015 2:37 PM

Why does my backup only have 3% free space left when my internal HD has 60% left?

Because it contains old files that have been deleted from the source volume. Time Machine manages space automatically. It's working as designed and you don't need to worry about it.

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HD has 60% free space. Backup has 3% free space

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