Recently I've been playing around with the Cyanogen nightlies on my N1. Nightly cm7 1-8 were fine but then one day I lost the home button so I had to backup and then wipe and then eventually everything was fine. But after the wipe Angry Birds was gone and even after I restore I don't have Angry Birds installed. If I install it is the save data still there?
Side note, when you do a backup with one Titianium, does it backup the save data too? Is that only if you have root? How would a non-root user do a backup? And why is the save data not just a database file somewhere that is easy to backup? Is the integrity of scores at risk or something?