Finding the size of each backup

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I have four websites and I’m trying to determine how often to backup each one to remote storage (Dropbox), but I don’t know how to find how much space each backup uses for each website. Can you tell me how to figure that out, please?

I’m also curious to know why it seems like Petawawa Pets takes nearly as much storage as SREDucation.ca when it is a significantly smaller website.
http://www.sreducation.ca = Web-server disk space in use by UpdraftPlus: 1.7GB 
http://www.ingenuitygroup.ca = Web-server disk space in use by UpdraftPlus: 627.2MB
http://www.lizlance.ca = Web-server disk space in use by UpdraftPlus: 884.2MB
http://www.petawawapets.ca = Web-server disk space in use by UpdraftPlus: 1.1GB 

The page I need help with: [log in to see the link]

 

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