
Look in the General section next to find the Used disk space.
Now, multiply the used disk space by 1.2; the result is the minimum amount of disk space Time Machine can work with. (That’s because Time Machine needs space for all your files plus some extra room to enable it to store new data and multiple copies of files that change.) However, more space is always better, because it enables Time Machine to retain backups that go further into the past. A backup disk with at least 1.5 times as much free space as the amount occupied on your local disk is recommended, and more if possible. If you find that you need more space for Time Machine later, you can resize the backup disk space.
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