Here is my Tiger story - maybe it will help someone
The product Superduper! (by Shirt Pocket) saved my iLife...
I wanted to upgrade from 10.2.8 to Tiger on my iMac G4. After many tries, I finally figured out that my disk had come bad/corrupted files. I wanted to instal via Archive-install and retain my apps and settings, but according to Apple this would be impossible without fixing the corruption. The only was to do this, according to them, was to back up and perform a clean install (erase and install). But, also according to them, I could not simply re-copy my backup back to the hard drive as I might be copying the corrupted files back into the hard drive. I have a firewire external drive but wasn't sure the backup would be bootable .
Anyway, I tried to repair the problem with disk utility, no go. Tried Applejack (said disk repaired but still could not install Tiger). Checked and repaired preferences, etc. Was about to try Disk Warrior or TechPro plus when I found SuperDuper.
Superduper clones your drive, so you can store your files safely, erase the bad volume, and then replace your files. In my case, I performed a full boootable backup of my hard drive to my external drive. Then I installed Tiger onto the external volume. I chose that external drive as my startup volume and went to work testing files and applications etc, until I felt comfortable that all was well. The I erased my hard drive with apple disk utility, and copied everything back to my hard drive, with the new os installed. After safely shutting down, I disconnected my external drive to prevent any problems, and rebooted my machine, which then defaulted to the correct startup volume which was my newly repaired and os-upgraded hard drive. Everything, and I mean everything, seems to be working fine. All music, photos, mail, and preferences (including settings etc.,) were retained correctly and are up and working.
If you have any issues at all, SUPERDUPER is the way to go if you have an external storage method.
BTW - the support at Shirt Pocket was exemplary. Dave N. (the owner of the product) returned all of my emails immediately and walked me through this process. I am no power user, and I was very nervous about erasing my hard drive, but he walked me through it and all went VERY well.
Surely this beats a clean install of a new OS, having to reinstall all my apps and settings, and hoping that the new OS would work.