Like a lot of cheap fools, I waited until after I had an "accident" on
a job before I purchased a UPS for my location rig. (someone pulled
the plug on my power strip a few minutes before the start of the
show!). OK, lesson learned.

While reading up on the different types of UPS systems, I learned that
the "online" (always on battery supply) version might be better than
the "line interactive (monitors situation and switches to battery when
necessary). But I couldn't find an online version that wasn't grossly
oversized (and expensive) for the single hard disk recorder that I
plan on running off of it. I ended up with a rackmount Tripp-Lite
line interactive product, the SmartPro 450.

One spec that shows up on line interactive models that is not
applicable to online versions is the switchover or transfer time.
(the time it takes to switch over to battery power after it has
detected some sort of power problem. My unit is listed at 2 to 4
milliseconds, but I don't have any idea of that is adequate or if its
long enough to make the UPS an expensive boat anchor? Anyone out
there have a clue about this stuff?