I'd rather have my personal private financial data securely in MY hands rather than on some faceless, nameless server out in cyberspace. Screw that.
That's why I not only do daily backups to my main HD but also to an SD card and to an external HD. That, and I have Quicken installed on my desktop AND two laptops. I even have a copy of Pocket Quicken on an old Axim X51v with a fairly solid two-way sync. This setup hasn't failed me in 20+ years, and I don't suspect it will anytime soon... I want to be sure my info is safe, rather than just "hope" someone else is doing it. Not to mention... once my info is "out there" - who else has access to it? I guarantee you, somebody does.