Is it bad to flash many roms on one phone or to be constantly installing and uninstalling things? Also, what is happening when I make backups of ROMS? Does all the data that was involved in that rom remain on my phone? I'm starting to have a lot of backups and have flashed many rom/kernal/radio combos and i'm wondering if this is bad for the phone. Can someone maybe point in the direction where I can learn about this more and how android ROMs work?