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If you need to find an offsite slave name server for one or more of your zones, ask your ISP whether slave name service is included in the package of services they offer you. If not, ask whether they offer the service for an additional cost.
If your ISP is unable or unwilling to handle slave name service for your zones, there are alternatives available. Nominum offers free slave name service for noncommercial use at http://www.secondary.com/. Nominum also operates a commercial slave-hosting service, called GNS (Global Name Service), at http://www.nominum.com/services/gns/, as does UltraDNS, at http://www.secondarydns.com/.
Finally, you may want to consider trading slave name service with another organization, say a partner company or a university you have a close relationship with.
Far too many organizations have a single point of failure in their DNS infrastructure: all of their authoritative name servers on the Internet are located on the same subnet, behind a single router. While many of these organizations would like to have an external slave name server, they're often scared off by the perceived expense of such a solution. But remember that you probably don't need to set up your very own offsite slave; many companies run slave name servers that are authoritative for thousands of zones, and they'd be willing to load your zone, too, for a reasonable sum of money.
The DNS & BIND Cookbook presents solutions to the many problems faced by network administrators responsible for a name server. This title is an indispensable companion to DNS & BIND, 4th Edition, the definitive guide to the critical task of name server administration. The cookbook contains dozens of code recipes showing solutions to everyday problems, ranging from simple questions, like, "How do I get BIND?" to more advanced topics like providing name service for IPv6 addresses.
