Thanks for the prompt reply! And sorry about my lack of clarity.
Could you provide some more information on the disk space usage? For instance, is there a specific directory where you notice a significant increase, and if so, how much of an increase do you see?
The old version of Site Publisher with just 3 templates was causing hardly any disk usage. The new templates seem to have more resources, and really big images (1.5 MB) for "office.jpg", for instance.
I think the problem is the backup feature. We are seeing users testing out Site Publisher and easily generating 100 MB of backup files. We do offer a stripped down plan (bundled with a domain registration) with just one email account, Site Publisher, and 100 MB disk space, so this is a bit of a problem!

We've increased that plan to 250 MB.
Maybe some limit in the backup size would be a good idea.
Regarding the "Powered by cPanel's Site Publisher." link, is this something you'd like to see removed, or is it not working properly?
I'd really like to see it removed. I don't really like to force advertising on customers, neither mine or someone else's. I hope this is possible in the near future.