On this quiet Sunday morning (and having just comes across it by accident), perhaps it's worthwhile resurrecting this ancient thread!

May I suggest that y'all start by taking a look at the initial post, then working your way through.

... then, has anyone cracked this one yet, or (indeed) have anything further to add? smile

My money goes on something like this:- any critical piece of kit that is not already battery-backed gets its own UPS screwed to the back (or the trolley, cart, whatever), set to give a clear (that is, loud) alarm whenever the mains plug is yanked out the wall. Hopefully, such a UPS need not be required to provide back-up power for more than a minute at most!

If you don't inspect ... don't expect.