First Method Using GUI:
Unfortunately, by default GUI mode is not enable, to enable it follow the instructions in the below article
Second Method Using command line:
To list IIS backups: %windir%\system32\inetsrv\appcmd.exe list backup
To backup IIS: %windir%\system32\inetsrv\appcmd.exe add backup “Backup-date”

Once the backup command is successful, the files can be verified in the default location C:\windows\system32\intersrv\backup\Backup-Name

To restore that backup:%windir%\system32\inetsrv\appcmd.exe restore backup “Backup-Date”
To delete a backup:%windir%\system32\inetsrv\appcmd.exe delete backup “Backup-date”

Web resources:

http://technet.microsoft.com/en-us/library/dd819406.aspx

http://blogs.iis.net/bills/archive/2008/03/24/how-to-backup-restore-iis7-configuration.aspx