Which Persona backup to use?

We are a high school with more then 100 Linux servers which gets their backup every night with Amanda backup. Only there are a few servers which are failing so now and then and this is because of the database which seems to be in use at that time. So someone advised me to use Percona.

But i’m a little confused. Which version of Percona should i use? I want one backup server which targets all MySQL servers to backup their databases. Which version is the appropriate one?