Hi,
From the error, it looks like you are restoring a share point portal server. Please try the steps below to isolate the cause of the issue :
Run a redirected restore to a temp directory of a
couple of files. If this becomes successful then we advise you to run the entire restore to a temp directory and then manually move them to the desired location.
Please also note that the credentials specified by the logon account used for backing up and restoring SharePoint Portal Server data must have local administrative rights on the server where SharePoint is installed. Additionally, to backup and restore individual documents in workspaces, the account must be granted the Coordinator role in SharePoint on all folders to be accessed in the workspace.
Hope that the above suggestions help.
Thanks!
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