Best option to back up mysql innodb partition We have a number of tables which we plan to partition based on months. The issue now before we can drop those partition we would like to perform backup. One option we found is this link http://www.percona.com/doc/percona-xtrabackup/howtos/recipes_ibkx_partition.html. Can any one suggest is the best mechanism or there other option such as mysqldump etc?
The Percona xtrabackup solution that you linked in your question is a good solution. It is a hot backup and doesn't lock innodb tables. I would prefer that to mysqldump in most cases. 

Did you try xtrabackup? Have questions about using it?