Does backing up, and then restoring that backup, backup, and restore the configuration of the AP's as well as the hive manager configuration? Or does a hive manager backup, only do the Hive manager settings?
The HiveManager backs up your AP configurations too. This means that, when you need to re-install HiveManager, and you restore your config (and give the HiveManager the same IP/subnetmask/gateway), all AP's will come online again with the same config. All you need to do next is send a config update out to the AP's and all should be working fine again. I usually run a full backup for these purposes.