I expand some of the errors:
{“ClassName”:“System.IO.IOException”,“Message”:“Unerwartetes Dateiende oder 0 Bytes vom Transportstream erhalten.”,“Data”:null,“InnerException”:null,“HelpURL”:null,“StackTraceString”:" bei Duplicati.Library.Main.AsyncDownloader.AsyncDownloaderEnumerator.AsyncDownloadedFile.get_TempFile()\r\n bei Duplicati.Library.Main.Operation.TestHandler.DoRun(Int64 samples, LocalTestDatabase db, BackendManager backend)",“RemoteStackTraceString”:null,“RemoteStackIndex”:0,“ExceptionMethod”:“8\nget_TempFile\nDuplicati.Library.Main, Version=2.0.5.1, Culture=neutral, PublicKeyToken=null\nDuplicati.Library.Main.AsyncDownloader+AsyncDownloaderEnumerator+AsyncDownloadedFile\nDuplicati.Library.Utility.TempFile get_TempFile()”,“HResult”:-2146232800,“Source”:“Duplicati.Library.Main”,“WatsonBuckets”:null}
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13 Aug 2020 20:14: Backend event: Get - Failed: duplicati-bf8b4f51f35754fb98fc8b783849a1c3e.dblock.zip.aes (49.99 MB)
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13 Aug 2020 20:14: Operation Get with file duplicati-bf8b4f51f35754fb98fc8b783849a1c3e.dblock.zip.aes attempt 5 of 5 failed with message: Unerwartetes Dateiende oder 0 Bytes vom Transportstream erhalten.
{“ClassName”:“System.IO.IOException”,“Message”:“Unerwartetes Dateiende oder 0 Bytes vom Transportstream erhalten.”,“Data”:null,“InnerException”:null,“HelpURL”:null,“StackTraceString”:" bei Duplicati.Library.Main.AsyncDownloader.AsyncDownloaderEnumerator.AsyncDownloadedFile.get_TempFile()\r\n bei Duplicati.Library.Main.Operation.TestHandler.DoRun(Int64 samples, LocalTestDatabase db, BackendManager backend)",“RemoteStackTraceString”:null,“RemoteStackIndex”:0,“ExceptionMethod”:“8\nget_TempFile\nDuplicati.Library.Main, Version=2.0.5.1, Culture=neutral, PublicKeyToken=null\nDuplicati.Library.Main.AsyncDownloader+AsyncDownloaderEnumerator+AsyncDownloadedFile\nDuplicati.Library.Utility.TempFile get_TempFile()”,“HResult”:-2146232800,“Source”:“Duplicati.Library.Main”,“WatsonBuckets”:null}
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13 Aug 2020 19:57: Backend event: Get - Started: duplicati-bf8b4f51f35754fb98fc8b783849a1c3e.dblock.zip.aes (49.99 MB)
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13 Aug 2020 19:57: Backend event: Get - Retrying: duplicati-bf8b4f51f35754fb98fc8b783849a1c3e.dblock.zip.aes (49.99 MB)
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13 Aug 2020 19:57: Operation Get with file duplicati-bf8b4f51f35754fb98fc8b783849a1c3e.dblock.zip.aes attempt 4 of 5 failed with message: Unerwartetes Dateiende oder 0 Bytes vom Transportstream erhalten.
{“ClassName”:“System.IO.IOException”,“Message”:“Unerwartetes Dateiende oder 0 Bytes vom Transportstream erhalten.”,“Data”:null,“InnerException”:null,“HelpURL”:null,“StackTraceString”:" bei System.Net.ConnectStream.Read(Byte buffer, Int32 offset, Int32 size)\r\n bei Duplicati.Library.Utility.Utility.CopyStream(Stream source, Stream target, Boolean tryRewindSource, Byte buf)\r\n bei Duplicati.Library.Backend.DropboxHelper.DownloadFile(String path, Stream fs)\r\n bei Duplicati.Library.Backend.Dropbox.Get(String remotename, Stream stream)\r\n bei Duplicati.Library.Main.BackendManager.coreDoGetPiping(FileEntryItem item, IEncryption useDecrypter, Int64& retDownloadSize, String& retHashcode)\r\n bei Duplicati.Library.Main.BackendManager.DoGet(FileEntryItem item)\r\n bei Duplicati.Library.Main.BackendManager.ThreadRun()",“RemoteStackTraceString”:null,“RemoteStackIndex”:0,“ExceptionMethod”:“8\nRead\nSystem, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089\nSystem.Net.ConnectStream\nInt32 Read(Byte, Int32, Int32)”,“HResult”:-2146232800,“Source”:“System”,“WatsonBuckets”:null}
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13 Aug 2020 19:40: Backend event: Get - Started: duplicati-bf8b4f51f35754fb98fc8b783849a1c3e.dblock.zip.aes (49.99 MB)
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13 Aug 2020 19:40: Backend event: Get - Retrying: duplicati-bf8b4f51f35754fb98fc8b783849a1c3e.dblock.zip.aes (49.99 MB)
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13 Aug 2020 19:40: Operation Get with file duplicati-bf8b4f51f35754fb98fc8b783849a1c3e.dblock.zip.aes attempt 3 of 5 failed with message: File length is invalid
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13 Aug 2020 19:26: Backend event: Get - Started: duplicati-bf8b4f51f35754fb98fc8b783849a1c3e.dblock.zip.aes (49.99 MB)
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13 Aug 2020 19:26: Backend event: Get - Retrying: duplicati-bf8b4f51f35754fb98fc8b783849a1c3e.dblock.zip.aes (49.99 MB)
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13 Aug 2020 19:26: Operation Get with file duplicati-bf8b4f51f35754fb98fc8b783849a1c3e.dblock.zip.aes attempt 2 of 5 failed with message: Unerwartetes Dateiende oder 0 Bytes vom Transportstream erhalten.
{“ClassName”:“System.IO.IOException”,“Message”:“Unerwartetes Dateiende oder 0 Bytes vom Transportstream erhalten.”,“Data”:null,“InnerException”:null,“HelpURL”:null,“StackTraceString”:" bei System.Net.ConnectStream.Read(Byte buffer, Int32 offset, Int32 size)\r\n bei Duplicati.Library.Utility.Utility.CopyStream(Stream source, Stream target, Boolean tryRewindSource, Byte buf)\r\n bei Duplicati.Library.Backend.DropboxHelper.DownloadFile(String path, Stream fs)\r\n bei Duplicati.Library.Backend.Dropbox.Get(String remotename, Stream stream)\r\n bei Duplicati.Library.Main.BackendManager.coreDoGetPiping(FileEntryItem item, IEncryption useDecrypter, Int64& retDownloadSize, String& retHashcode)\r\n bei Duplicati.Library.Main.BackendManager.DoGet(FileEntryItem item)\r\n bei Duplicati.Library.Main.BackendManager.ThreadRun()",“RemoteStackTraceString”:null,“RemoteStackIndex”:0,“ExceptionMethod”:“8\nRead\nSystem, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089\nSystem.Net.ConnectStream\nInt32 Read(Byte, Int32, Int32)”,“HResult”:-2146232800,“Source”:“System”,“WatsonBuckets”:null}
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13 Aug 2020 19:09: Backend event: Get - Started: duplicati-bf8b4f51f35754fb98fc8b783849a1c3e.dblock.zip.aes (49.99 MB)
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13 Aug 2020 19:09: Backend event: Get - Retrying: duplicati-bf8b4f51f35754fb98fc8b783849a1c3e.dblock.zip.aes (49.99 MB)
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13 Aug 2020 19:09: Operation Get with file duplicati-bf8b4f51f35754fb98fc8b783849a1c3e.dblock.zip.aes attempt 1 of 5 failed with message: File length is invalid
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13 Aug 2020 18:52: Backend event: Get - Started: duplicati-bf8b4f51f35754fb98fc8b783849a1c3e.dblock.zip.aes (49.99 MB)
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13 Aug 2020 18:52: Backend event: Get - Completed: duplicati-i314fabda56b04871abdbc629194796eb.dindex.zip.aes (38.62 KB)
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13 Aug 2020 18:52: Backend event: Get - Started: duplicati-i314fabda56b04871abdbc629194796eb.dindex.zip.aes (38.62 KB)
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13 Aug 2020 18:52: Backend event: Get - Completed: duplicati-20200807T045649Z.dlist.zip.aes (1.14 MB)
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13 Aug 2020 18:52: Backend event: Get - Started: duplicati-20200807T045649Z.dlist.zip.aes (1.14 MB)
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13 Aug 2020 18:52: Backend event: List - Completed: (162 bytes)
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13 Aug 2020 18:52: Backend event: List - Started: ()