I've twice now tried to initiate a TimeMachine backup, and both times they got stuck during the "Preparing Backup..." stage. I think even on the same file, as shown in tmutil status which got stuck both times when processing file 1117289. I've restarted the computer.

According to some support links on the web, I should try to get rid of the .inProgress file on the TimeMachine backup server. From what I understand, it's located in the .sparsebundle file corresponding to my backup.

However, opening the contents of the sparsebundle, I do not see it. When I instead try mounting the sparsebundle, I get the following Finder error message:

Image: my-backup.sparsebundle | Reason: Resource temporarily unavilable

I'm not sure what the issue is here. I'm running TimeMachine on a Synology NAS on the network. Running macOS 10.12.4.

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