Okay, so you have used some mysqldump to backup some of your data. But have you wondered how to test your backup? What if mysqldump does not really 'backup' your data? It is actually quite simple to test your backup and that is to verify the restore of your backup.
Here are a couple of ways to test your backup recovery (assuming that you have restored your backup already).
1. Do a select count(*) on all your tables before and after you restore your data.
2. Do a md5sum on your MySQL files before and after you restore your data.
Obviously when you do test your recovery process, you need to make sure that no data is being changed while you are doing it.