Basically that would be a nandroid backup of your system and data, it copies a zip of all your partitions to your sdcard (i.e. a snapshot of your phone's firmware and data), which can be restored by flashing it. You need a custom recovery for that which would probably mean unlocking your bootloader, which ironically wipes your data.... There are a lot of apps that will backup your app/system data, but they won't do a system image backup, just your data. You
can use ADB to do a full backup details of which are on xda
here, but it depends on which version of android you're running. If you need further advice feel free to ask, as always.
— modified on Apr 12, 2014, 9:28:39 PM
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