I got an 871 and beleive me, most of that was based on my field experience and NOT the measureup software.
45 questions and 1-17 of them were on backups alone, that's over a third!!

I don't have a problem with backups per se, but the exam asked some fairly detailed questions about them that were never in MeasureUp or the MS press book.
Maybe since 70-290 is a very widely taken test and over the years all the other questions have fallen prey to cheating? MAybe they need to test on the minute details of shadow copy.
All measureUp tested on backups was "if you do a full on monday and diffs the rest of the week, how many tapes need to be restored....yadda yadda yadda." No MS quesiton asked about the number of tapes to restore. On top of that there were a few detailed questions on shadow copies, and i'm not talking about the obvious stuff like setting it up or restoring a file. It asked some detailed info that I haven't seen in any materials. Obviously I can't tell ya because of the NDA.
So my advice, study backups, Remote Desktop and get practice on simulations cause there were about 5 of them that focused on user account management and sharing.