A recent power outage resulted in the inability to load any dashboard pages, although calling admin or login URLs directly worked fine. Nothing special in catalina.out, but PostgreSQL was complaining about unexpected EOF.
In the end I stopped Tomcat, restored the PostgreSQL connect DB from a daily dump, and used Time Machine to restore the file library from the same time as the PG dump. Everything seems to be OK with one surprising exception - there are now triplicate photos in all profiles that have photos.
The photo viewer shows triplicate previous / next links; and deleting any of the three photos deletes all. It seems that the photo objects exist once but are displayed three times. See the symptoms at http://connectadirondacks.com
This does beg the question of how best to backup and restore; but in the meanwhile if anyone has ideas on how to eliminate the triplicate photos I would really appreciate it. Aside from deleting and re-uploading to a few dozen profiles, I'm stumped on what else to try.