upstream with vps

[mdwalter]

thanx for answer me. 
The all vps  is in different datacenter europa and usa.  
Yes I know 1000 visitors in 24h for this server is not problem: 0.69
visitors every second, but in reality the visitators can be 500 in same
moment, maybe this is reason I make the load balancing and sure never
know... some time some datacenter can came down.
I wanna know if the back server can work like front server too.
Thank again for answer :)

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,236068,236078#msg-236078