With the Acquisition of GWAVA, Retain & Reload are going to be the solutions going forward. Look for tighter integrations in the future. Also look for their own Ideas portals in the near future.
We use commvault, they used to have an agent to backup GW but dropped it due to lack of interest or development. I have seen Commvault's Exchange agent and I like that you can restore individual emails, contacts, calender items from the same console I use to restore files and databases with for the entire system. I would like to see Microfocus make a bigger effort to work with the top backup providers to provide plugin agents to make this possible. I can easily see how commvault agent could maybe be configured as a "trusted app" so backup and restore is possible without having to setup *another* server/solution for backup.
I contacted them and its a wait and see effort, i asked if this would make integration for the next version and response was "To be confirmed, but stay tuned."