Nagios full copied reserve server

[magic_rooter]

Hello everybody. I need to have nagios reserve server which will
replace the main server when it dies. I installed nagios on another
machine, copied all directory /usr/local/nagios and start reserve
service Nagios.
I have thound that statistics differs very much! Of course, nagios was
installed in different time on each server. But when I copy status.dat
file from the main server, availibility statistics on the reserve
server became the same! But AFTER RESTART it returnes to  its previos
state:(.

So, I can't solve this problem, because I can't understand what files
I need to copy in order to make  the full copy:(.

I must mention that reserve server must not work all time. It has  to
be turn on ONLY when main server dies. So, what about availibility
statistics?
How to make statistics on reserve server STRONGLY the same as on the
main server?

With the great respect to everybody, Kristine
Linux System Administrator

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