Please excuse the following newbie questions but I have not been through an update before so I don't know what to expect or what, if anything I need to do to prepare for it. Do I need to back up any data, contacts, etc? I understand that information on the SD card should remain unaffected. Will my current apps show after the update and will they work as before and have the same settings/configurations? Email accounts (Pop3 and Exchange) and contacts listings? If the update goes badly, can I perform a factory reset and revert back to Froyo? Thank you in advance for helping a newbie understand this update process.