Error: "Backup Failure: Could not find required XVA" on NetScaler SDX

After upgrading NetScaler SDX and Netscaler VPX firmware to any newer version you will get daily notifications about backups failing: For Example the Log Message is as below: Local0.Error 10.xx.xx. svmevent: GMT : EVENT BACKUPFAILED : 127.0.0.1:BackupFailure: - Could not find required XVA for...