Failed to create a snapshot

Support
1

Hi kenkendk ,
When a file is open, snapshot error and Authority error taking.

DeletedFiles: 0
DeletedFolders: 0
ModifiedFiles: 2
ExaminedFiles: 2243
OpenedFiles: 3
AddedFiles: 0
SizeOfModifiedFiles: 8091
SizeOfAddedFiles: 0
SizeOfExaminedFiles: 91166626
SizeOfOpenedFiles: 8155
NotProcessedFiles: 0
AddedFolders: 0
TooLargeFiles: 0
FilesWithError: 1
ModifiedFolders: 0
ModifiedSymlinks: 0
AddedSymlinks: 0
DeletedSymlinks: 0
PartialBackup: False
Dryrun: False
MainOperation: Backup
compactresults:
    DeletedFileCount: 0
    DownloadedFileCount: 0
    UploadedFileCount: 0
    DeletedFileSize: 0
    DownloadedFileSize: 0
    UploadedFileSize: 0
    Dryrun: False
    MainOperation: Compact
    ParsedResult: Success
    EndTime: 29.8.2017 06:36:14
    BeginTime: 29.8.2017 06:36:14
    Duration: 00: 00: 00.0660273
    backendstatistics:
        RemoteCalls: 8
        BytesUploaded: 200621
        BytesDownloaded: 200621
        FilesUploaded: 3
        FilesDownloaded: 3
        FilesDeleted: 0
        FoldersCreated: 0
        RetryAttempts: 0
        UnknownFileSize: 0
        UnknownFileCount: 0
        KnownFileCount: 9
        KnownFileSize: 72285973
        LastBackupDate: 29.8.2017 09:36:10
        BackupListCount: 3
        TotalQuotaSpace: -1
        FreeQuotaSpace: -1
        AssignedQuotaSpace: -1
        ParsedResult: Success
deleteresults:
    DeletedSets: []
    Dryrun: False
    MainOperation: Delete
    ParsedResult: Success
    EndTime: 29.8.2017 06:36:14
    BeginTime: 29.8.2017 06:36:14
    Duration: 00: 00: 00.3383362
RepairResults: null
testresults:
    MainOperation: Test
    Verifications: [
        Key: duplicati-20170829T063610Z.dlist.zip
        Value: [],
        Key: duplicati-ib5c59b9791fc48fcb2b11aa42f1c570f.dindex.zip
        Value: [],
        Key: duplicati-b038c1b2d1f324cdbbd24895d1102c36d.dblock.zip
        Value: []
    ]
    ParsedResult: Success
    EndTime: 29.8.2017 06:36:15
    BeginTime: 29.8.2017 06:36:15
    Duration: 00: 00: 00.5069126
ParsedResult: Error
EndTime: 29.8.2017 06:36:16
BeginTime: 29.8.2017 06:36:10
Duration: 00: 00: 05.5542992
Messages: [
    No remote filesets were deleted,
    Compacting not required
]
Warnings: [
    Failed to create a snapshot: System.UnauthorizedAccessException: An attempt was made to perform an unauthorized operation.
   Location: Alphaleonis.Win32.Vss.VssBackupComponents..ctor ()
   Location: Alphaleonis.Win32.Vss.VssImplementation.CreateVssBackupComponents ()
   Location: Duplicati.Library.Snapshots.WindowsSnapshot..ctor (String [] sourcePaths, Dictionary`2 options)
   Location: Duplicati.Library.Snapshots.SnapshotUtility.CreateWindowsSnapshot (String [] folders, Dictionary`2 options)
   Location: Duplicati.Library.Main.Operation.BackupHandler.GetSnapshot (String [] sources, Options options, ILogWriter log) => An attempt was made to perform an unauthorized operation.
    Roaming \ Thunderbird \ Profiles \ w3jtlb4m.default \ parent.lock => C: \ Users \ aa \ AppData \ Roaming \ Thunderbird \ Profiles \ w3jtlb4m.default \ parent.lock 'file.
]
Errors: []
2

I edited your post to improve the formating. (Just added ~~~ before and after the output you pasted, see here for details).

3

You need to run Duplicati as Administrator, otherwise it will not have permissions to create a snapshot. A snapshot gives full read access to the entire disk, so it is something that normal users should not be able to do.