I need a backup but havn't made one :/

An old admin got the password of current one and opped everyone, they destroyed whatever they want and they gived themselve whatever they want :/

I need to:
- mass deop everyone; - how to check who are ops?
- rollback the world 2 hours ago - structures and inventories;

Haven't coppied the world folder for days, even 24 hours rollback will be great compared to what is now :/

Please - give me ideas how to fix this huge issue I have :/

Plugins I use: Permissions, big brother, lockete;

Others I supose will not have any infulence of the situation.

The solution I got at the moment is:
Ban every opped youser and just dont let him play anymore.
BB Rollback every opped user for 24 hours.

Anyone with better idea :/?

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

I guess you could check the op-file, ops.txt to see who is op. And take the server off the net for a while, do some rollbacks and deop everyone. Or just shut off the server and delete the ops-file and then start it again. And then op yourself in the console.