Strange errors still appears - remote files, unexpected number, etc

I have 3 backup tasks creatred on Windows 10 Pro machine (accounting sw data backuped) to USB HDD
Backups are set to run in midnight, when accounting sw is unopened.
First manual run work great, but automated tasks fails wit strange error messages - see attachments



I tried rebuild database, run repair, but this repeated again and again

Is there need add some file exclusions or how I can better debugg errors?

Some error logs:

2021-09-29 14:56:45 +02 - [Warning-Duplicati.Library.Main.Operation.Backup.FileBlockProcessor.FileEntry-PathProcessingFailed]: Failed to process path: C:\mrpwin\pu\DATA0353\srv.lock
{
  "DeletedFiles": 10,
  "DeletedFolders": 8,
  "ModifiedFiles": 556,
  "ExaminedFiles": 274745,
  "OpenedFiles": 674,
  "AddedFiles": 118,
  "SizeOfModifiedFiles": 15771202,
  "SizeOfAddedFiles": 23893048,
  "SizeOfExaminedFiles": 8554569450,
  "SizeOfOpenedFiles": 41784260,
  "NotProcessedFiles": 0,
  "AddedFolders": 33,
  "TooLargeFiles": 0,
  "FilesWithError": 0,
  "ModifiedFolders": 0,
  "ModifiedSymlinks": 0,
  "AddedSymlinks": 0,
  "DeletedSymlinks": 0,
  "PartialBackup": false,
  "Dryrun": false,
  "MainOperation": "Backup",
  "CompactResults": null,
  "VacuumResults": null,
  "DeleteResults": {
    "DeletedSetsActualLength": 0,
    "DeletedSets": [],
    "Dryrun": false,
    "MainOperation": "Delete",
    "CompactResults": null,
    "ParsedResult": "Success",
    "Version": "2.0.6.3 (2.0.6.3_beta_2021-06-17)",
    "EndTime": "2021-09-29T13:02:32.2001183Z",
    "BeginTime": "2021-09-29T13:02:03.0819339Z",
    "Duration": "00:00:29.1181844",
    "MessagesActualLength": 0,
    "WarningsActualLength": 0,
    "ErrorsActualLength": 0,
    "Messages": null,
    "Warnings": null,
    "Errors": null,
    "BackendStatistics": {
      "RemoteCalls": 8,
      "BytesUploaded": 41994495,
      "BytesDownloaded": 74049281,
      "FilesUploaded": 3,
      "FilesDownloaded": 3,
      "FilesDeleted": 0,
      "FoldersCreated": 0,
      "RetryAttempts": 0,
      "UnknownFileSize": 0,
      "UnknownFileCount": 2,
      "KnownFileCount": 203,
      "KnownFileSize": 5264775859,
      "LastBackupDate": "2021-09-29T14:55:06+02:00",
      "BackupListCount": 3,
      "TotalQuotaSpace": 500104687616,
      "FreeQuotaSpace": 493850890240,
      "AssignedQuotaSpace": -1,
      "ReportedQuotaError": false,
      "ReportedQuotaWarning": false,
      "MainOperation": "Backup",
      "ParsedResult": "Success",
      "Version": "2.0.6.3 (2.0.6.3_beta_2021-06-17)",
      "EndTime": "0001-01-01T00:00:00",
      "BeginTime": "2021-09-29T12:55:06.7161026Z",
      "Duration": "00:00:00",
      "MessagesActualLength": 0,
      "WarningsActualLength": 0,
      "ErrorsActualLength": 0,
      "Messages": null,
      "Warnings": null,
      "Errors": null
    }
  },
  "RepairResults": null,
  "TestResults": {
    "MainOperation": "Test",
    "VerificationsActualLength": 3,
    "Verifications": [
      {
        "Key": "duplicati-20210929T125506Z.dlist.zip",
        "Value": []
      },
      {
        "Key": "duplicati-i0304e50f33a247edbf59e16ec69edd27.dindex.zip",
        "Value": []
      },
      {
        "Key": "duplicati-bb5a6e614c2cd4090a2c3ee574d2f5441.dblock.zip",
        "Value": []
      }
    ],
    "ParsedResult": "Success",
    "Version": "2.0.6.3 (2.0.6.3_beta_2021-06-17)",
    "EndTime": "2021-09-29T13:02:34.5462395Z",
    "BeginTime": "2021-09-29T13:02:32.6772228Z",
    "Duration": "00:00:01.8690167",
    "MessagesActualLength": 0,
    "WarningsActualLength": 0,
    "ErrorsActualLength": 0,
    "Messages": null,
    "Warnings": null,
    "Errors": null,
    "BackendStatistics": {
      "RemoteCalls": 8,
      "BytesUploaded": 41994495,
      "BytesDownloaded": 74049281,
      "FilesUploaded": 3,
      "FilesDownloaded": 3,
      "FilesDeleted": 0,
      "FoldersCreated": 0,
      "RetryAttempts": 0,
      "UnknownFileSize": 0,
      "UnknownFileCount": 2,
      "KnownFileCount": 203,
      "KnownFileSize": 5264775859,
      "LastBackupDate": "2021-09-29T14:55:06+02:00",
      "BackupListCount": 3,
      "TotalQuotaSpace": 500104687616,
      "FreeQuotaSpace": 493850890240,
      "AssignedQuotaSpace": -1,
      "ReportedQuotaError": false,
      "ReportedQuotaWarning": false,
      "MainOperation": "Backup",
      "ParsedResult": "Success",
      "Version": "2.0.6.3 (2.0.6.3_beta_2021-06-17)",
      "EndTime": "0001-01-01T00:00:00",
      "BeginTime": "2021-09-29T12:55:06.7161026Z",
      "Duration": "00:00:00",
      "MessagesActualLength": 0,
      "WarningsActualLength": 0,
      "ErrorsActualLength": 0,
      "Messages": null,
      "Warnings": null,
      "Errors": null
    }
  },
  "ParsedResult": "Warning",
  "Version": "2.0.6.3 (2.0.6.3_beta_2021-06-17)",
  "EndTime": "2021-09-29T13:02:34.8212238Z",
  "BeginTime": "2021-09-29T12:55:06.7161026Z",
  "Duration": "00:07:28.1051212",
  "MessagesActualLength": 23,
  "WarningsActualLength": 1,
  "ErrorsActualLength": 0,
  "Messages": [
    "2021-09-29 14:55:06 +02 - [Information-Duplicati.Library.Main.Controller-StartingOperation]: The operation Backup has started",
    "2021-09-29 14:55:19 +02 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Started:  ()",
    "2021-09-29 14:55:19 +02 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Completed:  (202 bytes)",
    "2021-09-29 15:01:40 +02 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Put - Started: duplicati-b34fb4253db624268bd9022b21110c20b.dblock.zip (19,35 MB)",
    "2021-09-29 15:01:42 +02 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Put - Completed: duplicati-b34fb4253db624268bd9022b21110c20b.dblock.zip (19,35 MB)",
    "2021-09-29 15:01:56 +02 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Put - Started: duplicati-i3da13c30177a4afb9a40caf9080de761.dindex.zip (84,81 KB)",
    "2021-09-29 15:01:56 +02 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Put - Completed: duplicati-i3da13c30177a4afb9a40caf9080de761.dindex.zip (84,81 KB)",
    "2021-09-29 15:02:02 +02 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Put - Started: duplicati-20210929T125506Z.dlist.zip (20,62 MB)",
    "2021-09-29 15:02:02 +02 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Put - Completed: duplicati-20210929T125506Z.dlist.zip (20,62 MB)",
    "2021-09-29 15:02:03 +02 - [Information-Duplicati.Library.Main.Operation.DeleteHandler:RetentionPolicy-StartCheck]: Start checking if backups can be removed",
    "2021-09-29 15:02:03 +02 - [Information-Duplicati.Library.Main.Operation.DeleteHandler:RetentionPolicy-FramesAndIntervals]: Time frames and intervals pairs: 7.00:00:00 / 1.00:00:00, 28.00:00:00 / 7.00:00:00, 365.00:00:00 / 31.00:00:00",
    "2021-09-29 15:02:03 +02 - [Information-Duplicati.Library.Main.Operation.DeleteHandler:RetentionPolicy-BackupList]: Backups to consider: 26. 9. 2021 18:45:54, 22. 9. 2021 20:30:36",
    "2021-09-29 15:02:03 +02 - [Information-Duplicati.Library.Main.Operation.DeleteHandler:RetentionPolicy-BackupsToDelete]: Backups outside of all time frames and thus getting deleted: ",
    "2021-09-29 15:02:03 +02 - [Information-Duplicati.Library.Main.Operation.DeleteHandler:RetentionPolicy-AllBackupsToDelete]: All backups to delete: ",
    "2021-09-29 15:02:32 +02 - [Information-Duplicati.Library.Main.Operation.DeleteHandler-DeleteResults]: No remote filesets were deleted",
    "2021-09-29 15:02:32 +02 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Started:  ()",
    "2021-09-29 15:02:32 +02 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Completed:  (205 bytes)",
    "2021-09-29 15:02:32 +02 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Get - Started: duplicati-20210929T125506Z.dlist.zip (20,62 MB)",
    "2021-09-29 15:02:32 +02 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Get - Completed: duplicati-20210929T125506Z.dlist.zip (20,62 MB)",
    "2021-09-29 15:02:32 +02 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Get - Started: duplicati-i0304e50f33a247edbf59e16ec69edd27.dindex.zip (77,84 KB)"
  ],
  "Warnings": [
    "2021-09-29 14:56:45 +02 - [Warning-Duplicati.Library.Main.Operation.Backup.FileBlockProcessor.FileEntry-PathProcessingFailed]: Failed to process path: C:\\mrpwin\\pu\\DATA0353\\srv.lock"
  ],
  "Errors": [],
  "BackendStatistics": {
    "RemoteCalls": 8,
    "BytesUploaded": 41994495,
    "BytesDownloaded": 74049281,
    "FilesUploaded": 3,
    "FilesDownloaded": 3,
    "FilesDeleted": 0,
    "FoldersCreated": 0,
    "RetryAttempts": 0,
    "UnknownFileSize": 0,
    "UnknownFileCount": 2,
    "KnownFileCount": 203,
    "KnownFileSize": 5264775859,
    "LastBackupDate": "2021-09-29T14:55:06+02:00",
    "BackupListCount": 3,
    "TotalQuotaSpace": 500104687616,
    "FreeQuotaSpace": 493850890240,
    "AssignedQuotaSpace": -1,
    "ReportedQuotaError": false,
    "ReportedQuotaWarning": false,
    "MainOperation": "Backup",
    "ParsedResult": "Success",
    "Version": "2.0.6.3 (2.0.6.3_beta_2021-06-17)",
    "EndTime": "0001-01-01T00:00:00",
    "BeginTime": "2021-09-29T12:55:06.7161026Z",
    "Duration": "00:00:00",
    "MessagesActualLength": 0,
    "WarningsActualLength": 0,
    "ErrorsActualLength": 0,
    "Messages": null,
    "Warnings": null,
    "Errors": null
  }
}

Hello and welcome!

Regarding:

found X remote files that are not recorded in local storage

Are you using a unique folder on your USB HD for each backup job? Never point more than one backup job to the exact same destination folder as it is unsupported and will lead to problems.

This message:

Failed to process path: C:\mrpwin\pu\DATA0353\srv.lock

Is probably due to the file being locked open. One solution is to use snapshot-policy but note that Duplicati must be run elevated to have rights to make snapshots.