With a simple test-restore of a single file (from dropbox destination), using the gui, I get an irrelevant warning. Log:
{ "BrokenLocalFiles": [], "BrokenRemoteFiles": [], "RestoredFiles": 1, "SizeOfRestoredFiles": 32648, "RestoredFolders": 0, "RestoredSymlinks": 0, "PatchedFiles": 0, "DeletedFiles": 0, "DeletedFolders": 0, "DeletedSymlinks": 0, "MainOperation": "Restore", "RecreateDatabaseResults": null, "ParsedResult": "Warning", "Interrupted": false, "Version": "2.2.0.3 (2.2.0.3_stable_2026-01-06)", "EndTime": "2026-02-10T09:44:31.5209494Z", "BeginTime": "2026-02-10T09:44:19.5780179Z", "Duration": "00:00:11.9429315", "MessagesActualLength": 8, "WarningsActualLength": 1, "ErrorsActualLength": 0, "Messages": [ "2026-02-10 10:44:19 +01 - [Information-Duplicati.Library.Main.Controller-StartingOperation]: The operation Restore has started", "2026-02-10 10:44:19 +01 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Started: ()", "2026-02-10 10:44:26 +01 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Completed: (4.77 KiB)", "2026-02-10 10:44:26 +01 - [Information-Duplicati.Library.Main.Database.LocalRestoreDatabase-SearchingBackup]: Searching backup 0 (09-Feb-26 15:52:51) ...", "2026-02-10 10:44:27 +01 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Get - Started: duplicati-bcbcc9b125128437bbf252c118fad4aca.dblock.zip.aes (49.59 MiB)", "2026-02-10 10:44:29 +01 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Get - Completed: duplicati-bcbcc9b125128437bbf252c118fad4aca.dblock.zip.aes (49.59 MiB)", "2026-02-10 10:44:29 +01 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Get - Started: duplicati-b5f185ec9c6ff4cc49fd6266cbb93ab08.dblock.zip.aes (49.34 MiB)", "2026-02-10 10:44:31 +01 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Get - Completed: duplicati-b5f185ec9c6ff4cc49fd6266cbb93ab08.dblock.zip.aes (49.34 MiB)" ], "Warnings": [ "2026-02-10 10:44:19 +01 - [Warning-Duplicati.Library.Main.Controller-OptionValidationError]: The value \"\" supplied to --backup-test-samples does not represent a valid integer" ], "Errors": [], "BackendStatistics": { "RemoteCalls": 3, "BytesUploaded": 0, "BytesDownloaded": 103737386, "FilesUploaded": 0, "FilesDownloaded": 2, "FilesDeleted": 0, "FoldersCreated": 0, "RetryAttempts": 0, "UnknownFileSize": 0, "UnknownFileCount": 1, "KnownFileCount": 4883, "KnownFileSize": 0, "KnownFilesets": 1, "LastBackupDate": "2026-02-09T16:52:51+01:00", "BackupListCount": 1, "TotalQuotaSpace": 0, "FreeQuotaSpace": 0, "AssignedQuotaSpace": -1, "ReportedQuotaError": false, "ReportedQuotaWarning": false, "MainOperation": "Restore", "ParsedResult": "Success", "Interrupted": false, "Version": "2.2.0.3 (2.2.0.3_stable_2026-01-06)", "EndTime": "0001-01-01T00:00:00", "BeginTime": "2026-02-10T09:44:19.5780193Z", "Duration": "00:00:00", "MessagesActualLength": 0, "WarningsActualLength": 0, "ErrorsActualLength": 0, "Messages": null, "Warnings": null, "Errors": null } }
This indicates that you have added an advanced option for --backup-test-samples but not given a value. You can argue that “no value” means the same as not providing the option, but IF you intended to provide a value, the warning would alert you to the fact that something is off.
I think the warning is relevant, and you should not add the option if you do not intend to set the value to something.
If I am missing context, let me know.
@kenkendk Thanks for the quick and useful replies!
backup-test-samples is set to 0 in the settings and not present in the advanced options of the backup.
Yet the warning still arises. Perhaps I really should do some checking.
Anecdotal: I was using copilot to get me off the ground in the use of duplicati.
This appears quite useful, but it has serious errors, like needing to store the database, the compression being a bottleneck because supposedly single thread and so on.