To your previous problem, to archive your MySQL database use CocoaMySQL: http://www.versiontracker.com/dyn/moreinfo/macosx/17838

choose a new connection.

host: localhost
(this specifies your computer if you are running CocoaMySQL
on the same computer as you MySQL database)
if its somewhere else (i.e. ISP server) then you should know this, cause I don't!
user: -next three same as in your wordpress config.php file
pass
database

once you connect, choose your database from the drop down menu on the left (if you didn't specify it on the log in) and choose file > export this will give you a text file with all the content of the DB. Open it and search for some words you have in your posts to make sure it works hunky dory.

To restore to an older version, delete the tables in you MySQL database. Then choose file import and point it at an old export file you want to restore the database to. It will import the tables from this file into the MySQL DB you have specified. If the tables are already there it has a hissy fit on ya. NOTE: if you need to do a site wide edit, export do a find replace then import it... voila. ALSO instead of deleting tables you could create a new database, import the tables to that then change the wp-config.php file to reference this new database. Just remember to set the privileges on this new table (i.e. a user name and pass) - ohh yea the weasel knows jack about shit

(What are tables? when you log in successfully you will see a list of tables like wp_comments, wp_content blah blah blah these are tables containing comments, posts.. blah blah and porn).

Now crack a beer and welcome to the hell that is geekdom. You will never have sex again, but you can still ride a bike just as fast as before.