I keep all my important documents off my computer on an external hard drive. I found external USB TB hard drives very economical. I usually save to my computer and then twice each week copy the contents of the "my documents" folder onto the external hard drive.
My free lance writing, both Hug Pages, and Kindle books I keep the files on another external USB TB hard drive. There have been times when I would be out and found myself with a lot of idle time. If I have my mini-laptop with me and take the external drive so I can write while I wait. Spend an hour or so just waiting for my car to be serviced as an example. A couple of my friends let me plug into the USB on their computer and work if I need to.
I don't trust computers, be it equipment or the Windows operating system. My laptop has "blue screened" a couple times already. With the external all I need is a USB connection and another computer to work with.
I agree with you. I consider my writings as well as all the time to create them as valuable assets. On three occasions I have been asked to lecture from what they read in my articles. As with any important documents I protect them with external storage/backup. My accounting records are backed up in case I them. I consider my writings just as important.