Preparing A500 for warranty service

I have a rooted A500 with HC3.2 and I strongly believe that the focus problem is hardware. Since I'm under warranty I don't think I'll waste my time and send the tablet to repair. Two questions: ### How do I fully backup my device (let's say "snapshot") in order to easily restore all apps, wallpapers, settings, etc (possibly accounts too) when it returns? I can easily backup programs, but I don't know about their data. I also have a Bitcoin wallet there, so I need to back my private keys up in order to receive coins at the same address later. ### How do I un-root and downgrade the firmware to Acer's original stock 3.0? When I updated Recovery I did a backup, so I believe the final step is to restore that backup. By the way, does Acer consider rooting a warranty breach for hardware problems? I know many manufacturers don't care if you change their firmware when you send them a device with clear hardware problems, but they eventually restore everything to stock. Thanks.