In the Carbon Copy Cloner overview, the developer has the following to say about that (and note that if you have already donated as the OP said he did you can disable the ads very simply with a clear conscience) :
"What does CCC cost?
Carbon Copy Cloner doesn't cost you a dime until you completely trust it. That's the way all backup software should work -- pay when you really feel confident that it's going to do the job that it claims. CCC is "uncrippled" shareware, meaning that all features are available whether you've paid or not. No registration is ever required, but once you trust it, a small donation is appreciated for continued development. Choose "Donate to Bombich Software" from CCC's Help menu to send a donation or use the link below. Thanks!
Note: You'll probably notice right away that there is now an ad banner at the bottom of the cloning status panel while CCC is running. I know what you're thinking, it's an abomination! Right? Well, whenever I post updates to CCC, my bandwidth costs go through the roof. Donations aren't keeping up. My options are either to stop delivering CCC or subsidize with ads. I have chosen to subsidize my bandwidth costs with advertising for a company that I know and trust, and can wholeheartedly endorse as a sponsor. I also introduced the ads as unobtrusively as possible -- in a location and at a time that shouldn't affect your use of CCC.
You can make the ads go away by sending in a donation! Simply click on the "I paid" button in the Donation dialog and the ads will no longer appear. If you're affiliated with an Education institution, please click on the "I paid" button *without* sending in a donation (seriously). And while you're waiting for CCC to do its business, feel free to check out Other World Computing's deals on hard drives, RAM, etc.

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