Shall I get Dropbox and use it also for WP backup?

As many of you, I am constantly editing files for my website on one computer or the other. I was thinking of a service like dropbox to work both as a way of automatically syncing and being an online backup space. Is dropbox a good service? Which alternative ones should I consider?

Plus... there seem to be a few WP plugins that schedule automatic backups of files+db and automatically send them to dropbox. Any experience and/or reccomendation on any of these?

thank you