What do you mean by adding a network drive to a samba server? If it is a NAS, it is another samba server all it's own. Do you mean you will be adding a hard drive to a samba server?
When you say the samba server is at another location, is it on another site, across the internet? If so, then smb isn't secure. Look at using a VPN tunnel, or use scp. Or look at webDAV or ftp. Although FTP isn't secure in its own right.
Ssh is good for secure tunnels using a single port, but Samba normally uses more than one port. So to use an ssh tunnel t secure the traffic, you need to run samba using only a single port. For that refer to the samba documentation. The one you want is "Samba 3 HOWTO & Reference Guide". You may be able to install a "Samba-doc" package. It contains this & two more books. Or google for the terms: `Samba3-HOWTO' ext