My question is, actually my OS is CentOS 5.8, if I make a backup of my virtualservers, and I do a new fresh clean installation of the OS like CentOS 6.2 and install Virtualmin again .... I will not have problems restoring backups.

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Howdy -- our recommendation for performing a migration is available here:

http://www.virtualmin.com/documentation/system/migrate

We'd recommend setting up a second server, rather than formatting your current one... that will allow you to perform testing prior to your new server being live.

Otherwise, there's always a risk of unexpected problems.

However, restoring the backups should indeed work, and migrating from CentOs 5 to CentOS 6 is supported.