[App_rpt-users] Beagle Board XM RTC

Hello, I'm using a BBxm and LOX interface combo. I noticed that the BBxm does not have a backup battery for the real time clock. It is an option. Do I need to have the RTC backed up by battery or does Asterisk/app_rpt get its time from an NTP server? Are most people running the BBxm without the battery? Thanks, Ken