Well, it seems quite a complicated problem you got there, but I think I can help you out
My first recommendation would be to try to map network drives to a drive letter using the following linkhttp://www.itechtalk.com/thread3673.html
However, a simpler option would be to resort to Cloud backup, as I myself have been using for years now! Personally, I'm using Zoolz ( www.zoolz.com ) from a company called ( www.genie9.com). Cloud computing removed all this hassle; I used to have those problems but since moving to cloud infrastructure
there are no more raids and external hard drives.
Good luck, and I hope I helped you out!