Backup failing with snapshot-policy = auto. Windows 11 showing following errors:
- 2025-07-17 11:12:35 -04 - [Error-Duplicati.Library.Main.Operation.BackupHandler-FatalError]: Fatal error UserInformationException: Failed to create a snapshot: The system or provider has insufficient storage space. If possible delete any old or unnecessary persistent shadow copies and try again.
- 2025-07-17 11:12:35 -04 - [Error-Duplicati.Library.Main.Controller-FailedOperation]: The operation Backup has failed with error: Failed to create a snapshot: The system or provider has insufficient storage space. If possible delete any old or unnecessary persistent shadow copies and try again. UserInformationException: Failed to create a snapshot: The system or provider has insufficient storage space. If possible delete any old or unnecessary persistent shadow copies and try again.
Duplicati.Library.Interface.UserInformationException: Failed to create a snapshot: The system or provider has insufficient storage space. If possible delete any old or unnecessary persistent shadow copies and try again.
â> Alphaleonis.Win32.Vss.VssInsufficientStorageException: The system or provider has insufficient storage space. If possible delete any old or unnecessary persistent shadow copies and try again.
at Alphaleonis.Win32.Vss.WaitCheckAndReleaseVssAsyncOperation(IVssAsync* pAsync)
at Alphaleonis.Win32.Vss.VssBackupComponents.DoSnapshotSet()
at Duplicati.Library.Common.IO.VssBackupComponents.InitShadowVolumes(IEnumerable1 sources) at Duplicati.Library.Snapshots.WindowsSnapshot..ctor(IEnumerable1 sources, IDictionary2 options) at Duplicati.Library.Snapshots.SnapshotUtility.CreateWindowsSnapshot(IEnumerable1 folders, Dictionary2 options) at Duplicati.Library.Snapshots.SnapshotUtility.CreateSnapshot(IEnumerable1 folders, Dictionary2 options) at Duplicati.Library.Main.Operation.BackupHandler.GetSnapshot(String[] sources, Options options) --- End of inner exception stack trace --- at Duplicati.Library.Main.Operation.BackupHandler.GetSnapshot(String[] sources, Options options) at Duplicati.Library.Main.Operation.BackupHandler.RunAsync(String[] sources, IFilter filter, CancellationToken token) at CoCoL.ChannelExtensions.WaitForTaskOrThrow(Task task) at Duplicati.Library.Main.Operation.BackupHandler.Run(String[] sources, IFilter filter, CancellationToken token) at Duplicati.Library.Main.Controller.<>c__DisplayClass17_0.<Backup>b__0(BackupResults result) at Duplicati.Library.Main.Controller.RunAction[T](T result, String[]& paths, IFilter& filter, Action1 method)
at Duplicati.Library.Main.Controller.Backup(String inputsources, IFilter filter)
at Duplicati.Server.Runner.Run(IRunnerData data, Boolean fromQueue)
Not sure if this is related to VSS (the VSS service is set to automatic and running):
c:>vssadmin list shadows
vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool
(C) Copyright 2001-2013 Microsoft Corp.No items found that satisfy the query.
c:>vssadmin list providers
vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool
(C) Copyright 2001-2013 Microsoft Corp.Provider name: âMicrosoft Software Shadow Copy provider 1.0â
Provider type: System
Provider Id: {b5946137-7b9f-4925-af80-51abd60b20d5}
Version: 1.0.0.7
Iâve tried increasing maximum storage space many times to different high levels (e.g., 20GB) but it makes no difference. This is what I see currently:
c:>vssadmin list shadowstorage
vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool
(C) Copyright 2001-2013 Microsoft Corp.Shadow Copy Storage association
For volume: (C:)\?\Volume{85b7ae64-8b2a-41f1-bac2-52d5bc5db304}
Shadow Copy Storage volume: (C:)\?\Volume{85b7ae64-8b2a-41f1-bac2-52d5bc5db304}
Used Shadow Copy Storage space: 0 bytes (0%)
Allocated Shadow Copy Storage space: 0 bytes (0%)
Maximum Shadow Copy Storage space: 1.25 GB (1%)Shadow Copy Storage association
For volume: (K:)\?\Volume{838c6ea1-fa22-41a2-9030-d56c70fa3108}
Shadow Copy Storage volume: (K:)\?\Volume{838c6ea1-fa22-41a2-9030-d56c70fa3108}
Used Shadow Copy Storage space: 0 bytes (0%)
Allocated Shadow Copy Storage space: 0 bytes (0%)
Maximum Shadow Copy Storage space: 256 MB (1%)Shadow Copy Storage association
For volume: (N:)\?\Volume{b6bd6ce9-eae2-4db0-b0df-961975cb7f2f}
Shadow Copy Storage volume: (N:)\?\Volume{b6bd6ce9-eae2-4db0-b0df-961975cb7f2f}
Used Shadow Copy Storage space: 0 bytes (0%)
Allocated Shadow Copy Storage space: 0 bytes (0%)
Maximum Shadow Copy Storage space: 1.88 GB (1%)
c:>vssadmin delete shadows /for=c: /all
vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool
(C) Copyright 2001-2013 Microsoft Corp.No items found that satisfy the query.
Iâm at a complete loss but wanted to check here before trying a different backup solution. Any thoughts please? Thanks.
Edit: vss writers seem to be OK:
c:>vssadmin list writers
vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool
(C) Copyright 2001-2013 Microsoft Corp.Writer name: âTask Scheduler Writerâ
Writer Id: {d61d61c8-d73a-4eee-8cdd-f6f9786b7124}
Writer Instance Id: {1bddd48e-5052-49db-9b07-b96f96727e6b}
State: [1] Stable
Last error: No errorWriter name: âVSS Metadata Store Writerâ
Writer Id: {75dfb225-e2e4-4d39-9ac9-ffaff65ddf06}
Writer Instance Id: {088e7a7d-09a8-4cc6-a609-ad90e75ddc93}
State: [1] Stable
Last error: No errorWriter name: âPerformance Counters Writerâ
Writer Id: {0bada1de-01a9-4625-8278-69e735f39dd2}
Writer Instance Id: {f0086dda-9efc-47c5-8eb6-a944c3d09381}
State: [1] Stable
Last error: No errorWriter name: âSystem Writerâ
Writer Id: {e8132975-6f93-4464-a53e-1050253ae220}
Writer Instance Id: {46eda21a-7c16-4b2c-a9e5-89802026be75}
State: [5] Waiting for completion
Last error: No errorWriter name: âASR Writerâ
Writer Id: {be000cbe-11fe-4426-9c58-531aa6355fc4}
Writer Instance Id: {060fb830-700e-40ff-a871-cd1962d9209f}
State: [1] Stable
Last error: No errorWriter name: âShadow Copy Optimization Writerâ
Writer Id: {4dc3bdd4-ab48-4d07-adb0-3bee2926fd7f}
Writer Instance Id: {130e264d-5a8b-4209-8222-e2d75c2398a6}
State: [1] Stable
Last error: No errorWriter name: âWMI Writerâ
Writer Id: {a6ad56c2-b509-4e6c-bb19-49d8f43532f0}
Writer Instance Id: {4dabc7c4-8b79-469e-b1db-16b053b302b0}
State: [1] Stable
Last error: No errorWriter name: âIIS Config Writerâ
Writer Id: {2a40fd15-dfca-4aa8-a654-1f8c654603f6}
Writer Instance Id: {ac8fa3a7-e68e-4200-b72f-3b0d52dc560f}
State: [1] Stable
Last error: No errorWriter name: âMSSearch Service Writerâ
Writer Id: {cd3f2362-8bef-46c7-9181-d62844cdc0b2}
Writer Instance Id: {50bdf0f0-7ebc-4b55-a595-1fb44a976832}
State: [1] Stable
Last error: No errorWriter name: âRegistry Writerâ
Writer Id: {afbab4a2-367d-4d15-a586-71dbb18f8485}
Writer Instance Id: {6712aa14-b3c2-427a-8c48-863ceeef47bf}
State: [1] Stable
Last error: No errorWriter name: âCOM+ REGDB Writerâ
Writer Id: {542da469-d3e1-473c-9f4f-7847f01fc64f}
Writer Instance Id: {d3cc4f07-9735-40b6-94f3-4b8a70b21584}
State: [1] Stable
Last error: No error