basic DNS zone questions

hello

I have 2 (basic, I belive) questions about DNS zones

1) I'm creating a "backup" server for DNS, so I'm copying the DNS zone files from the main server to this other server
I know there're other (probably better) ways to do that, but at this time I'll say I have some reasons to consider this solution
my doubt is: should I change the SOA? may I keep the old "ns1.maindomain.com" or I should change do "ns1.backupdomain.com" for example?

2) may I add a NS entry anywhere in the zone file?
for example... the file will already have?
domain.com. 14400 IN NS ns1.maindomain.com.
domain.com. 14400 IN NS ns2.maindomain.com.

then I'd like to add:
domain.com. 14400 IN NS ns1.backupdomain.com.

can I add this to the end of the file or it must be below the other 2 entries? (my guess is that I can add anywhere, since the parser probably doesn't look for blocks)


thanks

 

 

 

 

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