Its trivial to backup your important emails offline as they come in. Any time you allow a 3rd party to control your data or your property (digital or physical)

Its trivial to backup your important emails offline as they come in. Any time you allow a 3rd party to control your data or your property (digital or physical) you are taking a chance. One of many reasons "the cloud" is overrated and overhyped. There may be reasons to use cloud computing, such as the convenience, but shared data-space always remains inherently insecure and anything stores there is, by definition, outside of your control.