I have an open Samba share on a router (Bt Home Hub 3/4) and intend to use it as a backup target. It's created automatically when a USB stick is inserted into the router. Unfortunately this share is not supported officially and afaik is uncontrollable.
I'm thinking of accessing the share as an rsync destination from Debian running in a VM hosted by Windows 7. I might, in some cases, access the share directly.
The problem is that the share is open, so any share-seeking malware will have an easy time finding and infecting the backup. I want to protect the share but of course i can't do that the 'proper' way - at the Samba server. So i need to protect it 'at the client' and am looking for ideas, both Windows -> Samba server and Linux -> Samba server.