Time Machine could not complete the backup
I tried to do I a TM backup and after a long wait from "Preparing To Backup Disk" I got the following message ...
Time Machine could not complete the backup.
This backup is too large for the backup disk. The backup requires 273.42 GB but only 188.44 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.
[ ? ] [ Open Time Machine Preferences ] [ OK ]
I use an external hdd parition exclusively for TM which has 400GB capcity and 188.44GB. Why won't it TM just overwrite the old backups / data?
I'm using Lion on mid 2009 Macbook Pro
Cheers.
MacBook Pro, Mac OS X (10.7.3)