Recently, we lost power. I was able to do a system shutdown before the power went out. However, the power came back before the UPS died. So I unplugged the RB1000 and plugged it back in.
Later I accessed the graphs, and they were all missing. I noticed that the time had reset, which is an issue with the RB1000 when it loses power. I have an ntp server set up but the time didn't get set and now all of the graphs are gone.