I'm glad I keep an older version of Skitch on my Mac. I reached my quota and the "See Premium Information" pop-up becomes a serious flicking PITA
Saving locally would be great because I've now seen the "See Premium Information" pop-up about 30 times in the last 15 minutes while making smaller changes to some screenshots.
It's too aggressive.
So while the month runs out I'll switch to my older Skitch 1.0.12 that'll only sync if I decide it will saving locally while backing up to Dropbox with a SymLink.