A Rakefile to backup your MYSQL datbases. Probably requires Ruby 1.9+
Place plain text files in lists/ . Each list should contain a list of database names, one per line. Feel free to generate this as you see fit.
Then:
rake backup:list:[listname]
will backup all those databases to backups/[listname]/[databasename];
rake restore:list:[listname]
will restore all the databases in backups/[listname];
rake backup:list:[listname]
will drop all the databases in that list.