Locate the Gzipped Tar archive file that you want to restore.
At the command prompt type --
Code:
tar -xzvf yourarchivename.tar.gz -C /path/to/your/vBulletin/folder
The tar -xvf command extracts files from a specified Tar archive file.
For compressed files, add the z switch for .gz
Use the -C switch to specify a target directory for the restored files.
The most common compression used with tar archives is Gzip which give an archive a .tar.gz extension.
Your Vbulletin web folder restore is complete.

