I've recently installed this on my network.
The IDR option, will protect any machines that you want on the network.
I am currently using the IDR option for both the backup server, and a remote database server.
The necessary disaster recovery information for the remote server is stored in an IDR directory that you specify on your backup server.
If I recall correctly, I think that you must have the Accelerator Agent installed on the remote machines before you can use IDR.
Hope this helps.
Rik