Backing up newer files, ONLY

When performing a PERMANENT BACKUP, does OpenDrive start the backup all over again, even for files that were already backed up? I think I'm looking for BACKUP to recognize that a file already exists and skip it while adding any new files/folders that may have been added to the source before the last backup. I did not choose SYNC because I do not want anything deleted from the OPENDRIVE when I delete from the SOURCE drive. I want to prevent accidental deletions by forcing the deletion to occur from the WEB interface, only.


Please advise. 


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