Last Updated: December 21st, 2012
If you're going to be messing around with custom ROMs at all, it's a good idea to have a nandroid backup at the ready. A recent backup can save you a lot of time and heartache if things end up going sideways. However, backing up your system used to mean rebooting into recovery and waiting for 5-10 minutes while everything progressed. That's not the end of the world, but every barrier to backing up makes people less likely to do it. With Online Nandroid Backup (or Onandroid for short), you can get a full backup done within Android itself.
Onandroid was originally developed by senior XDA-Developers member Ameer Dawood for Sony Ericsson Xperia devices specifically.
Last Updated: January 20th, 2011
In this tutorial, I will guide you through the easiest and most reliable way to fully and 100% back up and restore your Android phone.
By fully back up, I don't mean backing up just your address book or your emails, or your dog. I mean EVERYTHING that resides on your phone with the exception of the SD card - what we will create is essentially a full image of your phone's current state that you can restore to at any time as if nothing happened. This image will be written to your SD card which you are then free to copy around and back up on your computer.