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 } }