It is always recommended to backup your existing code, packages and all other important stuff before a new deployment. The same is applicable to SharePoint as well.
But what if you do not have a backup of existing WSP Solution ?Well, you can use PowerShell to extract/download the wsp solution from SharePoint FARM.
Extract wsp solution using PowerShell script
$farm = Get-SPFarm
$file = $farm.Solutions.Item("mysolution.wsp").SolutionFile
$file.SaveAs("c:\mysolution_backup.wsp")
where,
mysolution.wsp = the name of solution which you want to extract
mysolution_backup.wsp = the name by which you want to save the solutionMore Posts related to SharePoint,
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