What's the point of Time Machine

After clearing up this 10.5.6 bug on Time Machine it got me wondering what the benefit of TM really is. I am a photographer dealing with large files but I never work on a single photo for more then one hour. My method of backing up is simple... download raw images from the CF card to the OS disk that I'll be working from as well as to two internal HD backup disks. As I work I put finished photos in a "finals" folder that is copied onto the backups as I go along. Indeed if the OS disk goes down while I'm working I have the raw files on two backups plus the finals folder as I may have backed up in that time frame. I understand TM will provide me with a fall back to previous edits of a single image but even so, this seems like a waste of a hard drive and perhaps more trouble than it's worth for the small effort to drag and drop occasionally. Perhaps TM is better for video work or am I missing something elemental here?

Carl,
CarlKramer wrote:
Excellent info, thanks. Two questions about the post.
How do I "flush" data of a backup HD to de-frag it?
Easy. Copy all the data to a second drive or volume, delete it from the first, then copy it back (or not). The most logical scenario is one where "live" data (that which is being edited or otherwise managed) is kept on one drive temporarily. When it reaches a state where the files will remain "static" in the future, those files are copied to the second drive/volume and deleted from the first. Since files will be written to the second "archival" drive sequentially, then never modified or moved again, fragmentation will always remain at essentially zero for that drive.
Fragmentation on the first drive will be eliminated when all data is removed from it. Alternatively, the volume can just be formatted (erased), but this isn't necessary.
Lets say I get a disk error and my boot system goes down. If I have been backing up the boot drive to an external with TM, what are the steps I would take to get total recovery?
A "Full Restore" is a function of the Leopard installer. Boot to the installation disk, then open the installer's "Utilities" menu. "Restore from a Time Machine Backup" is at the bottom of the menu. You are asked to connect the backup drive. When it is mounted, it is scanned for valid backups. A list appears, and you choose which backup you would like to restore (presumably the most recent, but you can choose any that exist). You then choose a destination for the installation. When it has been restored, the machine reboots to the restored installation ad you're back up & running.
Unlike a "normal" installation of OS X, restoring a backup is dependent only on the direct transfer speed from the backup drive. Where a bare installation of Leopard might take as long as 2 hours, a restoration of Leopard plus all applications and user data takes only minutes (in my case, 45).
You would normally be using this feature after having used Disk Utility (in the same menu) to erase the faulty startup drive. However, it can also be used, and quite handily, to move an installation from one drive or machine to another.
Scott
P.S. If fragmentation on a startup disk becomes and issue (rare with OS X, but it can happen with the types of file mentioned earlier), restoring from a Time Machine backup after an erasure can be an excellent solution! -s

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