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Apple Desktops Discussion of Apple's desktop machines including Mac Pro, iMac, Power Mac, and mini

Cannot use Time Machine to backup to external drive


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starkraving

 
Member Since: Dec 06, 2008
Posts: 8
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Hi, hope someone can help:

I have an early 2008 iMac with a 500GB hard drive (currently 433GB used)

I have a Verbatim 500GB external drive which I have just erased (format: MAC OS Extended (Journaled), (says 499.32GB is free)

I went into settings, Time Machine, and selected the external drive to use for backups, however Time Machine reports the following error, and I don't understand why 516.38GB is required, when my hard drive is only 500GB.

"Time Machine could not complete the backup to external hard drive

This backup is too large for the backup disk. The backup requires 516.38 GB but only 499.32 GB are available.

Time Machine needs work space on the backup disk, in addition to the space required to store backups. Open Time Machine preferences to select a larger backup disk or make the backup smaller by excluding files."
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starkraving

 
Member Since: Dec 06, 2008
Posts: 8
starkraving is on a distinguished road

starkraving is offline
Resolved by removing some files from the backup schedule - still dont understand why Time Machine needs so much space though!
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