I have a Time Machine Drive at home and one in the office. They backup data once an hour every hour, as I'm always connected to either one via networking.
I also have a 100gb Google Drive account where everything I work with is backed up constantly.
I also have a Dropbox account doing the same thing.
These days, I'm paranoid about data as I have had experience with a massive data loss in the past. I don't leave anything to chance now
All my music rips are thrown into iTunes Match. Then I remove the songs from my hard drive. I only rip the CD's there to get them into iTunes Match. I'm always connected to the internet on my Macbook Pro so I don't need to waste space with music. Between iTunes Match and Spotify I have everything music wise I ever need.