I've been having some troubles getting a backup to run on my Synology ds211j NAS enclosure. The attached/embedded jpeg images show the issue and the configuration. It's a simple backup of one 3TB drive to another of equal capacity. The target drive is freshly formatted with more than enough free space. But when the backup task runs, I get this error:
"Failed to backup because backup space is insufficient."
I'm not sure how to proceed from here; don't know what else to try.