Original post has got lost, and I've no idea why, so that's one thing.
The other thing is, when does the site wipe its data?
No worries; it usually happens near the end of June, so you've got a while.
As Fuzzy said, both FAWM and 50/90 are in the month or so leading up to the challenge. Typically about three weeks. I'd recommend archiving now (or in a few more weeks) and then planning on an archive about a month or so before the challenge starts if you get more comments between the two times. Which happens, but not much.