Kevin Willis said: >If you use Disk Utility to create a disk image of your start up >drive, will it be a bootable back up? This was a matter of discussion on the Mac-L list recently. If you use the "Restore" tab in Disk Utility (OS X 10.3 and 10.4, but not 10.2) you can create a bootable clone of your drive to another drive. It will not create a disk image. See: The Missing Manual, page 320. http://www.macosxhints.com/article.php?story=20031030154346917 http://pinkmutant.com/articles/trouble101.html http://www.hmug.org/man/8/asr.php >Also, would I need to save it >in a compressed format, or does it need to be read/write? The Restore tab in Apple's Disk Utility works almost exactly like Carbon Copy Cloner. It makes an exact bootable clone of your disk. The only options are to erase, or to leave alone the data on the destination disk, and to do a checksum integrity test of the data being copied. However, this feature does not offer syncronization of files, to update your clone. (As CCC does with PSYNC.) Note that the fields in Restore can be dragged and dropped into. Randy B. Singer Co-Author of: The Macintosh Bible (4th, 5th and 6th editions) Routine OS X Maintenance and Generic Troubleshooting http://www.macattorney.com/ts.html