an array is a single disk, so any normal backup and restore method should work once you have established the array - though if the array is maintained by the OS, as it usually is in Linux, you have to install the OS to build the array.

The backup shouldn't care if it's backing up to or restoring to an array or to a single disk.

With hardware RAID controllers there is usually an OS specific step in setting up the array, but the array is built before installing the OS so the install sees a single disk.