MySQL Enterprise Backup (MEB) provides an easy way to perform incremental backups. You do have to know the log sequence number or LSN1 of the previous backup. And you can find the LSN in the meta/backup_variables.txt file from the previous backup.
MEB saves all the changes from the specified previous backup, see the mysqlbackup: INFO: Backup contains changes from lsn 14652513 to lsn 14659161 line from the following:
$ ./mysqlbackup --incremental -u root -p
--incremental-backup-dir=/home/dstokes/foo2 --with-timestamp
--start-lsn=14652512 backup
MySQL Enterprise Backup version 3.6.0 [2011/07/01]
Copyright (c) 2003, 2011, Oracle and/or its affiliates. All
Rights Reserved.
INFO: Starting with following command line ...
./mysqlbackup --incremental -u root -p
--incremental-backup-dir=/home/dstokes/foo2 …