any idea about the issue.
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From Discovery documentation:
Windows share (SMB) backups
An OS level defect can prevent Windows share backups from completing. The verification step fails with the message "ERR
OR: Cannot read file ... Unexpected end of stream".
To workaround this problem:
1. Mount the share (that you want to backup to) on the appliance, or on a spare Linux host.
2. Use SSH (or local) backup to the directory used to mount the Windows share.
Do not disable the verification step for Windows share backups. If you do so, and the backup fails because of this defect,
you will receive no notification of the failure.