HD size necessary for Time Machine backup?

S

Sprite948

Registered
My iMac has a 500 GB HD; about 100 GB is used. What size external HD is necessary for a Time Machine backup: 100 GB? 500 GB? More?
 
Equal to or greater than the capacity of the drive you wish to back up.

In your case, if you have a 500GB internal drive, you would need a 500GB (or larger) Time Machine drive.
 
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