There is a snapshot on the virtual machine named Hades. Some backup programs may give an error while there is a snapshot on the virtual machine. Can you delete Snapshot and try again?--
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According to the file name "...-000004.vmdk", your VM has active snapshots. Unless you keep them by intention, please consider to delete them from the Snapshot Manager, and then try the backup again.
Thanks for the help, that its correct
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