Grabbing would absolulely work, but it's a bit labour intensive compared to "drag & drop" and I'd also be concerned about losses associated with digital to analogue and back to digital.
My aim is to do quick, easy, accurate backups.
The DVR has a removable HD.
If I can't access the saved files via network, could I pull the HD, whack it into the PC and read it? Would it be recognised?