Posts of complete topics are gone suddenly

Hello.

In my forum ( barhammer40k.createaforum.com ) suddenly the entire posts of several topics are completely gone. No admin did that. The maintenance option didn`t bring them back and just said that there were no errors. What happened? Server crash? Something wrong? Is there a log or a backup to see what happened? Maybe we got hacked?

Please help, it were our most vital topics where we run our roleplays.

Thank you very much.

It breaks apart more and more. Codes are gone, members loose permissions. What is happening?

I would check your moderation log.
Change passwords. Remove any admins/global mods that might have had access. No daily backups. Backups once a month and not easy to recover.

Yeah great, moderation log is empty. 

Whoever did this is sitting there right now and laughs like a retard about us.

Time to create a forum somewhere else I guess...

Thanks anyway...

One thing I would suggest never give anyone admin/mod unless you really trust them and give them a unique password. Same for your account.