I have never fully trusted the cloud. I use a few services, staying at the "free" level, but not for back-up or critical storage. I use Dropbox because it integrates nicely with my Android phone and other devices, especially for cell phone photos. I use Google Drive to exchange files among my Chromebook, Windows and Linux computers, etc.
But I (quickly!) make physical back-ups on flash drives, external hard disks and CD-ROMs.
My first experience with a cloud service shutting down was with Ubuntu One. Again, I didn't panic because I already had local copies of everything I had in the "cloud."
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