Time travel query! sounds fun.
Point in time query sounds less fun but more accurate. Indeed, even a useful feature if you design your system around it. Pricings based on order time tied to currency rates at the time of order coding being something alot easier to code for with this feature. Of course would make you somewhat tied to db2 then, but even though you know IT software lasts in alot of cases until you draw a pension the accountants will swallow the fact you will replace it all in 5 years time :D.
Still the only question left is will it backup faster?