Keeping in view of the sad incident which removed forums database.. still such things are expected in the world of internet. bring back punbb for the sake of speed isnt the best idea overall..secured forums take the priority over speed always.
when the forum is hacked pings by (www.siteuptime.com) will tell the forum is up.. owever if the monitered URL (secret ) is a forum thread then removing database will remove that monitored thread too.. thus thus database removal will intiate the siteuptime.com email/sms alert which can be forwarded to multiple admins whoever is online.
This might not save the database but it will atleast help u find out at what time database was removed or site stopped functioning and u can trace back..
just a suggestion which might help in future.. lets ssay what log analyzer tells