Another thig you learn the hard way -
When you are using STSADM -o export
You should use STSADM -o import
So far so good... buy when the time in the night gets late - and you try to use STSADM -o restore... that can take a while to figure out :)
So - wierd thing is you will get an error saying the backup is from a newer SharePoint version and you need to update your installation... Naturally - I wasted a good hour making sure I have latest version intalled.
Goggle did not help on this one... Finally I noticed I am using the wrong command - So if you googled this in the same situation - make sure you are using the correct command!
Backup - Restore
Export - Import