Peter, my best suggestion to you and everyone is to buy an external HDD, as large as you can afford, 2tb, 3tb or whatever your data requirements are, copy all your data from my documents folder to this or where-ever you keep it, unplug it and repeat this process once a week or month so at least you have a copy if something goes wrong.
I keep saying to myself that I should take my HDD round to my parents, that way I've got an offsite backup in case of fire but never got round to it.
Another alternative is to use a cloud based solution, Hotmail's OneDrive, Google Drive, Dropbox etc, usually, any changes made to your docs are automatically synced out to the cloud but this depends on how much data you've got to store.
Good luck and be vigilant with emails