After the backup is completed the logs contain the following:
Cleaning up backups of “Database” database at Google Drive destination “Username”
Cleaning up “Backups\Database” folder
Deleting old backup of “Database”. Backup type: “Full”. Backup time: “04/15/2017 01:05:38”. Files: “Database201704150100.7z”
Destination error: Value cannot be null.
Parameter name: itemId
(Repeat 3 x)
Failed to clean up backups of “Backupjob.jobx” job: [DST-5:1107#1] Failed to delete file “” > Value cannot be null.
Parameter name: itemId
This occurs consistently for 2 jobs, including full and incremental backups