Schofield's Second Law of Computing, states that data doesn't really exist unless you have at least two copies of it. It's generally accepted that backups don't really exist unless you have at least three copies on different media in different solutions, and that deleting one must not affect or interact any of the others.

The difference between Synchronised and Backups
Firstly you need to understand how synchronisation works. With synchronisation if you delete a file on your local device it will delete the same file that is stored in the cloud. Generally speaking this is how services such as Google and DropBox work they are merely mirror images of what is on your PC or Laptop. This is generally acceptable for most home users but businesses cannot afford to have files deleted, companies need the ability to effectively 'go back in time' they need to retrieve files created one, two, three or more days previous. To that end companies use what is known as Incremental Backups these are copies of data on your PC, Laptop or Server but rather than a synchronised copy a backup will create a new instance of your data each time you backup thereby creating multiple copies each different from the other, each one representing a days work.

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