A while back, I developed a PowerShell script that I use for creating air gapped backups of my file data. Even though I put a lot of effort into building this script and testing it over and over again ...
Also keep in mind that a LaunchAgent will only run if a user is logged in. If you want this to run even when sitting at the login window, make a LaunchDaemon. It can be the same plist, just a matter ...
I'm able to execute wbadmin start backup -backupTarget \backup-device\file_backup\ include:d Folder1,"d Very Important" -vsscopy -quiet via cmd.exe just fine. However ...