Cloud storage is so commonplace now that its name doesn't sound quite as mystical and ethereal as it did a few years ago. That doesn't make it any less useful, as storing your personal data online is - for the most part - much safer than keeping it on a fragile old hard drive. We're prepared to accept accusations of bias here, as our favorite cloud storage app is Google Drive. it's baked into most Android devices, Google is always giving extra GBs of storage space away for free, and it's synced up with the handy Google Docs office suite. It's the undisputed champ.