Use Desktop Manager. When you open DM while your phone is connected you'll
see the "Backup/Restore" icon.
Maybe a bit off-topic, but if you don't know how to backup your phone to begin
with it's probably a bad idea to try to install a beta OS, let alone 5.0
alright, well i backed it up, and i upgraded my phone from the 4.0 or something to the 4.5, so i might upload it to 5.0 so idk yet i just want to know more about it.