Data store Server goes down (And you have a backup from the Data store available, If you don’t you WOULD have to recreate all the farm settings) dsmaint backup takes a backup of the data store.
Run a dsmaint migrate to migrate the settings to a new data store. Even if a Data store is unavailable the LHC contains enough INFORMATION about the farm to allow normal operations for an INDEFINITE period of time. However, no new information can be published, or added to the farm, until the farm data store is online. If you need to start from scratch with a new data store, PREPARE a new data store the way you did before configuring XenApp and run the Server Configuration TOOL from any farm server. After running the Server Configuration Tool, manually reenter the lost settings. If you use the same name as he previous data store, you do not need to reconfigure the farm servers.