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Reducing the delay occured during DNS change

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We have hosted our website in a windows server 2008 r2 with Godaddy and as a disaster recovery plan we do have backup of all website data and database files.We also have backup server which is similar to our original server(The server has same configuration). In the backup server i do have all website files and database files as in original server so i can use it when required such as during server crash. My plan is to use the backup server and shift my domain from one server to another server if original server goes down. But shifting the domain requires DNS change, which requires almost 4-5 hours to take effect. So in case of any disaster i may require about 5 hours to shift domain to another server due to delay in DNS changes. So i want to know how can i change the DNS and make it to effect as soon as possible without any delay or in a least time.So can anyone come up with solutions for the delay caused by DNS changes to a domain.
asked Apr 20, 2013 by anonymous  

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In Godaddy DNS Manager, the minimum TTL is 30min(See picture below)

 enter image description here

If you need 4-5hr to switch dns entries, your current TTL properly is set to 12hr.

I would advice you pickup the phone and call Godaddy to see if their premium dns packages allow you to set dns TTL to 1min.

Otherwise you may have to switch dns provider or host your own dns, which you will have full control of the TTL.

answered Apr 20, 2013 by anonymous  
Domain registry TTL only apply if you are switching DNS server or transferring from one registrar to another one (eg. switching from Godaddy to another company)
Which nameserver should i use actually for a domain? Should i use my own name server or name server of registerer? Which is best?
That really depends. Godaddy does have a huge infrastructure with minimum downtime. However, if you need a dns with low TTL like 1 to 5 min to switch A record quickly, you either have to run your own or find dns hosting (no need to change registrar, but company/service that host dns) that allow low TTL
Does a premium DNS helps me in this case? I think it has a secondary DNS which can work during failure of DNS. Does it help in case of server crash?
I did a search about Godaddy Premium DNS TTL minimum, base on a forum post it is same at 30min. But you can should call godaddy to verify
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