I have a number of clouds going for various things. There is so much free storage available you might as well take advantage of it. I use OneDrive for all my business related files - some tax info, Quickbooks backups, some website stuff etc. Then I have a Dropbox which I use to send large files to people. I also have a Google Drive which I use to store all of my manual pdf's which I can then access on my phone when I'm out and about (might as well get some manual reading done on the subway). I also use this to transfer photos and videos from my phone to my desktop, saves having to mess about with USB cables or emailing things to myself. And then of course I use CrashPlan to back up all of my music projects.
I guess I have other "clouds" going on too - for instance I use Evernote to store all kinds of notes that I've made, which I can access in a web browser or an iPhone app. And a while ago I totally ditched Outlook calendars for Google calendars - I have lots of calendars on the go for my business and it's great to know they're always there in my Google account to access on my phone (and the iPhone app I use is actually more powerful than Outlook for the hardcore calendar editing I have to do on a daily basis).
These are indeed amazing times.
Can you imagine how pissed Freddie Mercury would have been if there had been a fire in the studio and his Bohemian Rhapsody tape, with all of its countless overdubs, was destroyed?