This application makes a backup or a protected backup of your device's root.
This device must already be rooted: OTA RootKeeper doesn't have the ability to root devices.
If several conditions are matched, OTA RootKeeper will make root survive OTAs and... pretty much well anything

− except /system partition formatting.
Requirement:
- /system partition as Ext2, Ext3 or Ext4
- Upgrades not formatting or overwriting completely the /system partition.
Typical systems where its perfectly effective:
- Nexus S
- Galaxy Nexus
- Every Honeycomb tablet
Typical system where the protection won't work:
- HTC Desire
- Samsung Galaxy Spica
- Samsung Galaxy S / SII
In most case, only manufacturer's original recovery is able to install OTAs. It should not interfere with OTA update process itself.
A bonus feature is present, allowing you to un-root your device while keeping a su backup.
This way you can naively hide root until you choose to restore it via without further complications.
This nifty feature work on every rooted device.