Online Storage
Online services, such as Xdrive, allow users to upload their files to a server for safe keeping. Although it may be convenient to have the data available wherever an internet connection is available, there are a few limitations.
The services generally charge a monthly fee relative to the amount of storage space required. At Xdrive, for example, 5GB of storage costs $9.95 per month, which can quickly add up to more than one would spend on any of the other options discussed.
Security is supposed to be very tight on these services, but no matter how secure it may seem, it is still just a password keeping prying eyes from your potentially sensitive documents.
The speed of your internet connection will also weigh heavily on the convenience of your backup, and no matter what type of connection you have; it can't compete with local data transfer rates.