[dnanian]

OK, Falk. The thing to do is to Archive and Install the OS on top of what you've already got. You're not going to get it to work with things this messed up.

So: Archive and Installer Tiger (if that's what you're running). Once that's done, THEN back up with SuperDuper! onto the external drive. Make sure you use "Backup - all files". You won't be able to test the backup since you can't boot from it, so look carefully at it.

Then, you should be OK to install/migrate.