I have browsed to and selected the UNC path “\\server\backup” as the source. When I select “Snapshot now” the status changes to “Uploading 0 bytes” and immediately stops. I also tried with a trailing “\” - “\\server\backup\” but it does the same thing.
In the main.log it looks like it is appending “backup” to my UNC path: [2020-12-27 19:18:40.918] [info] snapshot error: upload error: open \\server\backup\backup: The system cannot find the file specified.
If I select an individual subfolder as my source (i.e. “\\server\backup\Documents”) the backup seemingly works as expected.