How do i upgrade kernel version ??

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http://forums.cpanel.net – How do i upgrade kernel version ?? If i restore websites after fresh installation..data center says it is a problem..:( My current kernel Version is 2.6.32-71.el6.x86_64. My data center tell me ... kernel up gradation on the server is not suggestible while the sites are live on the server , there may be file integration mismatch with respect to OS or WHM which will actually corrupt the data and websites hosted may go down .. If i ask my datacenter to take a Back up and re install the server with updated / Current stable kernel version .. Will it be possible for me to restor (HowTos)