Can I remove it?
 

I want to remove what happened from XXX until now without import a backup.
Can I do it?

You may remove threads in admin co > threads & posts > prune > select criteria > prune

No I want restore all what happened without import a backup.

Everything is most likely gone if you don't have a backup.

You best bet is to contact your host and ask them if they have an backups of your site.

that's not only my host.
it's a host of many sites I'm hosting on server.
and it's abut my friend name

The only way to 'go back' in time on your forums and undo everything is to import a backup from that time.

ok so I cant.