Time machine: How to choose instead of exclude?

Hi,

I want to make another small backup on a USB with my most important stuff (files/spreadsheets/photo's) that are irreplacable, would both my computer and backup disk fail somehow.
Now, the only way I think this is possible, is to exclude everything from my backup that I don't want in there, but is it possible to do it the other way around?
I'd rather select 3 folders I want backed up, instead of excluding the 20 others I don't.

Could anyone help me out on this? Or is there another program that would fit my needs?

Regards

 

Great!

I'll check it out. But does it also start working automatically when you plug your drive in, like it does with time machine?

Like, I want to make a backup with my most important stuff on a USB thumb drive that I can take wherever. And whenever I feel like making a backup of the stuff (or if it needs backing up), I could just plug it in, and CCC will start working automatically?