Had this problem a while ago in, I think, v18.104.22.168 and just disabled it but I recently revised some backups and figured I’d give it another shot. Same problem.
So, all my backups are run via command-line script using task scheduler and ‘Run with highest privileges’ checked. I also get the same problem when run from an elevated command prompt. The backup task is run daily and all source drives are local and run NTFS. Here’s the relevant log output:
Checking remote backup …
Backend event: List - Started: ()
Listing remote folder …
Backend event: List - Completed: (2.35 KB)
Scanning local files …
282 files need to be examined (282.39 GB)
Fatal error => Value cannot be null.
Parameter name: source
System.ArgumentNullException: Value cannot be null.
Parameter name: source
1 source, Func2 selector)
at Duplicati.Library.Snapshots.UsnJournalService.Initialize(IFilter emitFilter, IEnumerable
1 prevJournalData) at Duplicati.Library.Main.Operation.BackupHandler.GetJournalService(IEnumerable1 sources, ISnapshotService snapshot, IFilter filter, Int64 lastfilesetid)
— End of stack trace from previous location where exception was thrown —
at CoCoL.ChannelExtensions.WaitForTaskOrThrow(Task task)
at Duplicati.Library.Main.Controller.<>c__DisplayClass13_0.b__0(BackupResults result)
at Duplicati.Library.Main.Controller.RunAction[T](T result, String& paths, IFilter& filter, Action
1 method) at Duplicati.Library.Main.Controller.Backup(String inputsources, IFilter filter) at Duplicati.CommandLine.Commands.Backup(TextWriter outwriter, Action1 setup, List
1 args, Dictionary2 options, IFilter filter)
at Duplicati.CommandLine.Program.ParseCommandLine(TextWriter outwriter, Action
1 setup, Boolean& verboseErrors, String args) at Duplicati.CommandLine.Program.RunCommandLine(TextWriter outwriter, TextWriter errwriter, Action1 setup, String args)
The error occurs regardless of whether --usn-policy is Auto or On (which further indicates something is wrong here since Auto is supposed to fail quietly).
I searched the forum for similar issues and didn’t find a match so I’m guessing this is something I’m doing? The backup runs just fine if I turn usn-policy off but I’d prefer it set to Auto.
Thoughts or suggestions welcome.
Edited to add that I’m currently running v22.214.171.124 canary on Win10 64.
Update: just thought I’d check out a possible cause with a source path with just the root drive and no directory (e.g. “E:”) which was a feature of a recent, though unrelated, bug. Ran the backup with --dry-run=On both with and without the root drive source but there was no difference; same error showed up both times.