MySQL backup of incremental changesets
It is probably your only option to use the Percona Xtrabackup tool. Fortunately, this is a free tool that has very good documentation. 

This tool takes backups in a physical way, rather than logical backups that mysqldump produces. This means that restore time is simply the amount of time required to copy the backup files into the MySQL datadir and not the time to process all the SQL statements in a mysqldump backup. Backup time is generally faster as well, and allows for the possibility for incremental backup.