@julien-f @DustinB3403 Thanks! I'll give this a try and report back. Unsure if this is the issue as I'd created the jobs recently and don't see a colon in the job ID or any of the IDs on the target or in the error.
Here's the error in the web-interface:
Error: ENOENT: no such file or directory, open '/var/nfsmounts/---nfsServerPath---/xo-vm-backups/831fcdfb-0304-216a-feec-8f549646288e/vdis/d8b24ab1-2bdf-484d-bd59-ea23bc4d2e9d/37d994ad-36c2-47ad-8242-a1e7db4f4b80/20190112T060003Z.vhd'