How to setup secondary name server

[Me.B]

In some VPS providers, have a resource named "virtual private network". Isn't better use this network to transfer data from master to slave? I think that doesn't use bandwidth quota.

VPS private network is usually intra-machine, so not public & seen more secure. For BW counting you should ask your ISP but DNS sync would not use that much BW & don't forget it's done over SSH so it's "secure" (unless the NSA tap it ;-) ).

M B