It's possible to configure the system so that on detection of a power failure, a UPS can shutdown the server modules. But the CMM, SCM and ESM would still be on and eventually when the UPS runs out of power, these modules would power down. This is perfectly ok and as long as the servers are safely powered down, your data will be flushed to disk, and everything will be in tact. The SCM, CMM and ESM don't need to be safely shutdown.
Tripp Lite has a unit which could do this