APNsBU is an Android application developed by XSYLUS that enables users to backup and restore their Access Point Name (APN) settings. The app is free to download and falls under the category of Utilities & Tools.

The latest version, 1.0.5 Beta, introduces a new feature that allows users to backup or restore their APNs to either internal or external storage. However, it is important to note that this feature may only work on Android OS JellyBean. If the external radio button appears disabled, it could be due to running an earlier version of the Android OS.

APNsBU offers multiple backups and restore options for APNs. The backup files can even be viewed with a database viewer. However, after restoring from an APNs backup, the phone must be rebooted in order for the settings to take effect.

It is worth mentioning that the app requires root access and BusyBox to function properly. If you have any features you'd like to see added to the app, the developer welcomes feedback through comments or email.

Overall, if you're looking for a reliable and easy-to-use app to backup and restore your APNs, APNsBU is definitely worth giving a try.