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The drawback to this approach is that you'd have to reproduce any wanted changes on your live site. But for content blocks, that's really just a matter of copy/paste.
You probably know this, but C5 sites are easy to clone---basically just copy/paste the files to somewhere else on the server, create a new db, and point the new config/site.php to your new db.
Move a site (to copy your site) -
http://www.concrete5.org/documentation/installation/moving_a_site...
concrete5 on MAMP -
http://www.concrete5.org/documentation/how-tos/designers/installing...
concrete5 on WAMP -
http://www.concrete5.org/documentation/how-tos/designers/installing...