Invalid Checksum Error when using Mega NZ

njinco · December 9, 2017, 4:59pm

Hi !

I always seem to get an error when i am using Mega.NZ as the backup site. The backup seems to complete but always with errors and i was wondering if it could affect my restore or future backups? if so how could i fix it? TIA

MainOperation: Test
Verifications: [
Key: duplicati-20171209T043050Z.dlist.zip.aes
Value: [
Key: Error
Value: Invalid file checksum
],
Key: duplicati-i2e91488fa2814fbc92d405237883f422.dindex.zip.aes
Value: [],
Key: duplicati-be0cffc5872fa4f31b895f38bda8d2f79.dblock.zip.aes
Value: [
Key: Error
Value: Invalid file checksum
]
]
ParsedResult: Error
EndTime: 12/9/2017 10:58:22 AM
BeginTime: 12/9/2017 10:53:36 AM
Duration: 00:04:45.2525792
Messages: []
Warnings: []
Errors: [
Failed to process file duplicati-20171209T043050Z.dlist.zip.aes => Invalid file checksum,
Failed to process file duplicati-be0cffc5872fa4f31b895f38bda8d2f79.dblock.zip.aes => Invalid file checksum
]
BackendStatistics:
RemoteCalls: 12
BytesUploaded: 0
BytesDownloaded: 4365
FilesUploaded: 0
FilesDownloaded: 1
FilesDeleted: 0
FoldersCreated: 0
RetryAttempts: 8
UnknownFileSize: 0
UnknownFileCount: 0
KnownFileCount: 267
KnownFileSize: 1383688719
LastBackupDate: 12/9/2017 12:30:50 PM
BackupListCount: 1
TotalQuotaSpace: 0
FreeQuotaSpace: 0
AssignedQuotaSpace: -1
ParsedResult: Success

kenkendk · December 10, 2017, 10:22pm

The error message indicates that the files are modified after downloading them.

Have you tested a restore?

njinco · December 11, 2017, 1:26am

no i haven @kenkendk. let me try see what happens.

njinco · December 12, 2017, 6:19pm

it restored fine though. should i be worried? i have test all the applications/files that was backup under it.

kenkendk · December 20, 2017, 10:04am

Maybe … it appears the error message originates from the Mega library:

github.com

gpailler/MegaApiClient/blob/838f093615d731b8834db74584155712139b4983/MegaApiClient/Exceptions.cs#L20


  }


  public ApiResultCode ApiResultCode { get; private set; }


  public override string Message
  {
    get { return string.Format("API response: {0}", this.ApiResultCode); }
  }
}


public class DownloadException : Exception
{
  public DownloadException()
    : base("Invalid file checksum")
  {
  }
}


public class UploadException : Exception
{
  public UploadException(string error)

Best I can understand, the error happens when the file is downloaded from Mega, but defect for some reason. If you get the same error repeatedly, maybe you can try downloading the file directly from Mega and see if it is broken?

When testing the restore, make sure you have --no-local-blocks set, otherwise Duplicati will use data from files on-disk to recreate the target files, which could hide problems with the remote data.