Failed to create a snapshot: 0x80042316 as of 2.3.0.0

Author: c-promptCreated Apr 28, 2026Updated Sep 4, 2026

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Environment info

Duplicati version: 2.3.0.1 - 2.3.0.1_stable_2026-04-24
Operating system: Windows 11 25H2 backing up to SMB drive
Backend: Debian 13

Description

Since upgrading to 2026-04-14 - 2.3.0.0_stable_2026-04-14, I am seeing almost daily errors for 2 of my backups that look like:

2026-04-28 17:55:00 -04 - [Error-Duplicati.Library.Main.Operation.BackupHandler-FatalError]: Fatal error
UserInformationException: Failed to create a snapshot: 0x80042316

These 2 backups are scheduled at the same time and run every 6 hours. Before the upgrade, I never saw these errors.

Edit: I should note that running these backups manually (i.e., separately) also produces the errors.

Debug log

{
  "DeletedFiles": 0,
  "DeletedFolders": 0,
  "ModifiedFiles": 0,
  "ExaminedFiles": 0,
  "OpenedFiles": 0,
  "AddedFiles": 0,
  "SizeOfModifiedFiles": 0,
  "SizeOfAddedFiles": 0,
  "SizeOfExaminedFiles": 0,
  "SizeOfOpenedFiles": 0,
  "NotProcessedFiles": 0,
  "AddedFolders": 0,
  "TooLargeFiles": 0,
  "FilesWithError": 0,
  "TimestampChangedFiles": 0,
  "ModifiedFolders": 0,
  "ModifiedSymlinks": 0,
  "AddedSymlinks": 0,
  "DeletedSymlinks": 0,
  "PartialBackup": false,
  "Dryrun": false,
  "MainOperation": "Backup",
  "CompactResults": null,
  "VacuumResults": null,
  "DeleteResults": null,
  "RepairResults": null,
  "TestResults": null,
  "LockResults": null,
  "RemoteSynchronizationResults": [],
  "ParsedResult": "Fatal",
  "Interrupted": false,
  "Version": "2.3.0.1 (2.3.0.1_stable_2026-04-24)",
  "EndTime": "2026-04-28T21:55:00.8681574Z",
  "BeginTime": "2026-04-28T21:55:00.0887927Z",
  "Duration": "00:00:00.7793647",
  "MessagesActualLength": 4,
  "WarningsActualLength": 0,
  "ErrorsActualLength": 2,
  "Messages": [
    "2026-04-28 17:55:00 -04 - [Information-Duplicati.Library.Main.Controller-StartingOperation]: The operation Backup has started",
    "2026-04-28 17:55:00 -04 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Started:  ()",
    "2026-04-28 17:55:00 -04 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Completed:  (140 bytes)",
    "2026-04-28 17:55:00 -04 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: QuotaInfo - Started:  ()"
  ],
  "Warnings": [],
  "Errors": [
    "2026-04-28 17:55:00 -04 - [Error-Duplicati.Library.Main.Operation.BackupHandler-FatalError]: Fatal error\r\nUserInformationException: Failed to create a snapshot: 0x80042316",
    "2026-04-28 17:55:00 -04 - [Error-Duplicati.Library.Main.Controller-FailedOperation]: The operation Backup has failed\r\nUserInformationException: Failed to create a snapshot: 0x80042316"
  ],
  "BackendStatistics": {
    "RemoteCalls": 2,
    "BytesUploaded": 0,
    "BytesDownloaded": 0,
    "FilesUploaded": 0,
    "FilesDownloaded": 0,
    "FilesDeleted": 0,
    "FoldersCreated": 0,
    "RetryAttempts": 0,
    "UnknownFileSize": 0,
    "UnknownFileCount": 0,
    "KnownFileCount": 140,
    "KnownFileSize": 922903420,
    "KnownFilesets": 80,
    "LastBackupDate": "2026-04-28T06:00:00-04:00",
    "BackupListCount": 80,
    "TotalQuotaSpace": 31028689108992,
    "FreeQuotaSpace": 24326687817728,
    "AssignedQuotaSpace": -1,
    "ReportedQuotaError": false,
    "ReportedQuotaWarning": false,
    "MainOperation": "Backup",
    "ParsedResult": "Success",
    "Interrupted": false,
    "Version": "2.3.0.1 (2.3.0.1_stable_2026-04-24)",
    "EndTime": "0001-01-01T00:00:00",
    "BeginTime": "2026-04-28T21:55:00.0888177Z",
    "Duration": "00:00:00",
    "MessagesActualLength": 0,
    "WarningsActualLength": 0,
    "ErrorsActualLength": 0,
    "Messages": null,
    "Warnings": null,
    "Errors": null
  }
}

Duplicati.Library.Interface.UserInformationException: Failed to create a snapshot: 0x80042316
 ---> System.Runtime.InteropServices.COMException (0x80042316): 0x80042316
   at Utils.ThrowIfFailed(Int32 hr)
   at Vanara.PInvoke.VssApi.CVssBackupComponents.StartSnapshotSet()
   at Duplicati.Library.WindowsModules.VanaraVssBackup.StartSnapshotSet()
   at Duplicati.Library.Snapshots.Windows.SnapshotManager.InitShadowVolumes(IEnumerable`1 sources)
   at Duplicati.Library.Snapshots.WindowsSnapshot..ctor(IEnumerable`1 sources, IDictionary`2 options, Boolean followSymlinks)
   at Duplicati.Library.Snapshots.SnapshotUtility.CreateWindowsSnapshot(IEnumerable`1 folders, Dictionary`2 options, Boolean followSymlinks)
   at Duplicati.Library.Snapshots.SnapshotUtility.CreateSnapshot(IEnumerable`1 paths, Dictionary`2 options, Boolean followSymlinks)
   at Duplicati.Library.Main.Operation.BackupHandler.GetFileSnapshotService(IEnumerable`1 sources, Options options)
   --- End of inner exception stack trace ---
   at Duplicati.Library.Main.Operation.BackupHandler.GetFileSnapshotService(IEnumerable`1 sources, Options options)
   at Duplicati.Library.Main.Operation.BackupHandler.GetSourceProviders(IEnumerable`1 sources, Options options, CancellationToken cancellationToken)
   at Duplicati.Library.Main.Operation.BackupHandler.GetSourceProvider(IEnumerable`1 sources, Options options, CancellationToken cancellationToken)
   at Duplicati.Library.Main.Operation.BackupHandler.RunAsync(String[] sources, IBackendManager backendManager, IFilter filter)
   at Duplicati.Library.Main.Operation.BackupHandler.RunAsync(String[] sources, IBackendManager backendManager, IFilter filter)
   at Duplicati.Library.Main.Controller.<>c__DisplayClass22_0.<<Backup>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at Duplicati.Library.Main.Controller.RunAction[T](T result, String[]& paths, IFilter& filter, Func`3 method)
   at Duplicati.Library.Main.Controller.Backup(String[] inputsources, IFilter filter)
   at Duplicati.Server.Runner.RunInternal(Connection databaseConnection, EventPollNotify eventPollNotify, INotificationUpdateService notificationUpdateService, IProgressStateProviderService progressStateProviderService, IApplicationSettings applicationSettings, IRunnerData data, Boolean fromQueue)

Source: duplicati/duplicati

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