09-23-2009, 03:45 PM
I also have one of the 1TB My Book drives and I use it for TM BUs for three laptops, each with 250 GB HDs or less. I did not partition the drive but I can see putting a limit on the size of the TM backup files. In my case, I use one machine nearly all the time and the others mostly when I travel, so their TM files remain relatively small.
I'd make the TM partition twice the size of the HD you're backing up. Too small and it will constantly be trashing older files. I second rz suggesting the 250 to be used as a clone. I actually have two for my main machine, backed up with CCC once a week, alternating between the drives. If your iTunes/photo libraries are getting too big for the iMac drive, I'd move them to the 1 TB MyBook.
I'd make the TM partition twice the size of the HD you're backing up. Too small and it will constantly be trashing older files. I second rz suggesting the 250 to be used as a clone. I actually have two for my main machine, backed up with CCC once a week, alternating between the drives. If your iTunes/photo libraries are getting too big for the iMac drive, I'd move them to the 1 TB MyBook.