CmdID / PowerShell / Cmdlets / Set
Set-WBPolicy
Sets the backup policy for scheduled backups. Windows Server PowerShell reference
From the Windows Server PowerShell reference 5 parameters Its page in the reference
Parameters
-AllowDeleteOldBackupsIndicates whether new backups can overwrite older backups.-Confirm, -cfPrompts you for confirmation before running the cmdlet.-ForceForces the command to run without asking for user confirmation.-PolicySpecifies a WBPolicy object that contains that contains a backup policy that this cmdlet updates.-WhatIf, -wiShows what would happen if the cmdlet runs.