Thanks for the awesome script, I've been using it for several years over phpmyadmin, which is just bloat IMO.
I often need to synchronize my live database to my local, and would be thrilled if an option in the dump settings could be added, so I could either enter manually "dump changes since <date>" or just "dump changes since last dump".
Right now my database is only 20MB, so it's not that big of a deal right now, but if I soon have to download 100MB each time, it would be great to have an option to just download the changes.
There is an ALTER export for synchronizing changes in the table structure. There is no possibility for Adminer to export just the data changes because they do not need to be timestamped. Maybe you are looking for http://dev.mysql.com/doc/mysql/en/replication.html