forum disapeared with copy , any way to backup?

hi
1.i wanted to uptodate my site. all of my pages was changes,then i copied the forum directory to another folder,and deleted www folder.
after uptodate, i copied again forum folder to its first place in www folder.
but it doesnt work, is unavailable and not known in vbuletin control page in cpannel.although its folder is full of same info
i have many important info in my forum,can help me
2.how anyone can bachup the forum and every time that install another forum, can inport this backup to forum?
thank you
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