I want to browse Exchange 2010 DAG from the Exchange Icon but that generates an error message “An error occurred while attempting to browse the contents of (domain name.local) A communication failure occurred.
I can only select the DAG if I add it under the user defined section.

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System Restore does not appear to be functioning correctly on
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A Volume Shadow Copy Service component encountered an
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What should I do to fix this so that I can access my files?
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You are facing this error message because of adding a new node via Exchange DAG. The Forest usually seeks for older values of DAG (host). To get fix this issue, point to backup windows and select Microsoft Database base Available Group. Now select Manage Forest, find the old Forest Entry and add a new DAG name. This will surely help you get fix the issue.
Hallo Evelyn,
Cause of the error:
In the event that the exchange DAG was rebuilt, or the node was replaced using a different node, then the issue you are getting is as a result of backup exec Forest entry still having access to the old DAG entry of the host.
The following is the resolution to it:
Regards,
Carl