What is the best backup app to run in order to back up your phone after root? or is there a better way to back up the phone after root rather than using an app?
IMO DroidXBootstrapper is the best way to back up your X. Just install, then choose bootstrap recovery...click OK, then reboot recovery. The phone will restart and give you a green menu list. use the volume up/down keys to choose backup/restore then choose backup. You select the menu items using the camera button (full press).
It will backup your entire phone which then gives you the safety of being able to play with roms, knowing you have a way to get the phone back to an operating state if something goes wrong.
My advice is, when you create backups, rename the file to something that will remind you of what that backup is. *remember there can be NO spaces in names...you'll get an MD5 checksum error if there is spaces*