My account became innactive a little bit over a month ago, I now have -31 hosting credits, and I realised that I had critically important information regarding a project I was working on with some others, and wondered if I start making posts immediatley to recover my account if the data would be accessible?

It says somewhere that as soon as you hit -30 credits it automatically deletes your files and whatnot. So .. I doubt it. :/ I guess you could always try asking an admin specifically, but if you're -31 I sincerely doubt it. Good luck.

Since, you are still in the [HOSTED] Group, Your account is safe. All you need to do is, get is un-suspended by getting credits.