Hi @nahimov 
It’s unnecessary to @mention a team member, so I’ve removed it. They often read meta anyway and will reply if they feel it’s needed.
There are always many people here, whether the team or not, willing to help.
Robert’s link is the standard procedure to follow when restoring the forum. Unless your forum hasn’t been updated for a long time (which is always a bad thing), you should be able to restore your backup on the last Discourse version without issues.