Time Machine large backup

thewall

macrumors regular
Original poster
Oct 2, 2007
100
4
U.K
I have just migrated all my data (t/m unplugged) from iMac to iMac and the T/M had only 50gb left out of 1tb.

I erased the external hd and now i'm starting from fresh but it says it is backing up 437gb why? when i look at about this mac i have 705gb left from 1tb where has the other 130gb come from.
 

Kissmyne

macrumors 6502
Apr 21, 2015
354
48
Do you have any external drives or devices plugged in? I've seen Time Machine "auto select" all drives not set for Time Machine backups.. i.e. if you do have other drives or devices with media storage attached... either disconnect them or add them to the Time Machine exclusion list if this is the case.

If this doesn't resolve the issue, Please provide OS X version, as well as screenshots of your Time Machine preferences window(s).
 

Kissmyne

macrumors 6502
Apr 21, 2015
354
48
If you look at your final screenshot, The drive capacity(Macintosh HD) is showing 1.11 TB and free is 705 GB. 1.11 TB converts to approx 1136 GB(~1.2 TB unformatted capacity), the difference between capacity and free in your screenshot being about 430 GB give or take. This is looking like expected behavior, as the math generally supports the size of the backup.
 
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