Time Machine "backup is too large" false error

[mtbdudex]

In the past few days I've gotten these Time Machine "backup is too large" false error's, see picts.

The backup volume is a 500GB drive, the iMac is a 500GB drive, with only 270GB or so used.

How to get it doing back-up's again??

 

[gmanterry]

Perhaps your "Time Machine" program went to Public School.

Your screen shots show that for some reason, Time Machine, can not do basic arithmetic. I have no idea how to correct that very basic function. If I were you, I think I would show the screen shots to someone at the Apple Store.


Terry

 

[mtbdudex]

Well;

I opened time machine, clicked on the failed info red "i", and it said "This backup is too large for the back-up volume", I thought ???

Went under get info and found out my iMac HD is not a 500GB but a 750GB, so I have just crept above the ability to back-up the iMac due to downloading MiniDV tape into iMovie and now the iMac has 467.07GB used space while the backup has 467.4GB total capacity.

Still, the time machine math in the original back-up error dialog boxes is wrong and kinda mis-led me, but now I understand fundamental issue.
Apple should be aware and "fix" their dialog box error message math.

a) short term solution: delete some un-needed files/applications
b) Then: Time for a bigger HD, a 1T would be just right