When I click on the button to calculate the backup size, it gives me a result of about 54 mb. However, when I run the backup, I get a 700 mb file. I think this is because it's backing up everything in my public_html directory, not just my wordpress stuff. I have about 5 sites that I host on the same server, and the plugin is backing them all up into the same file. I've tried exclusions using relative and absolute references, but it doesn't seem to help.
My directory structure is like this:
/me/public_html <--main site
/me/public_html/site2
/me/public_html/site3
/me/public_html/site4
/me/public_html/site5