Percona XtraBackup for Mysql 5.1.49-3

I’m trying to try out Percona XtraBackup on my server, but i have some doubts about:
what is the right version to download and specially for Debian6 architecture x86_64?
I’m told about before installing something i need to check dependencies, so installing whatever i need would it damage anything on my server or would update something like Mysql or Apache? (my server has Mysql and PHP), because would be terrible if XtraBackup update something.
Do i need any special configuration on my server after installing?