Which version for MySQL 5.5.x

I’ve started looking at the potential option of using Percona XtraBackup. The version I have on my test system is 2.2.9 xtrabackup --version

However, my databases are all MySQL 5.5.x

Will this version work ok (for both backup and restoring to MySQL 5.5) or should I use a different version?

If so, is there an easy way to upgrade / downgrade?