WSP-Backup

WSP backup through power shell script

Open Sharepoint PowerShell program using Run as Administrator.

Execute the following set of commands

$farm = Get-SPFarm
$file = $farm.Solutions.Item("Name of WSP.wsp").SolutionFile
$file.SaveAs("E:\SharePointSolutionBackupfolder\Name of WSP.wsp")

Once the above command executed successfully the WSP file will be available in the mentioned folder path.