Sorry I didn't respond, I thought it did but I guess it didn't make it for whatever reason.
In this case, I am just doing testing/learning on Endpoint Backup. I am on a laptop, so I only have the 1 internal drive. I wanted to try a volume restore from within windows, I couldn't restore to my original disk because that is active drive. So my only other options was a USB drive. (Obviously I could used the endpoint boot disk, but I wanted to see what I could do using the restore within Windows it self.)
I agree with you on why the USB drives are disabled, that could cause some major problems. So USB should be excluded by default. However I would like a option to turn off that exclusion. In my mind a Hard drive is a Hard drive no matter what interface it is using, I prefer having my options open.
If your looking for a use case here is one I have done in the past with other products. That would be restoring Computer A with Computer B. For example if you are having problems restoring on Computer A, for example can't boot from the restore disc or there isn't a good network connection at the computer to transfer 30+ GBs. I can always grab Computer A's hard drive drop it in a UBS to SATA converter plug it into computer B Restore to the drive.
I admit that is not the norm, and I could easily use a e-sada or plug the drive in internally on computer B but like I said I always like to have the option to do it.