Problem of going digital 2

A point that I discover:

Going digital can be danger.
Why?

Because they are not physical object.(If we don't print it out)
If our computer suddenly down, lose all the data, the artworks will also disappear.

This is one of my experience,
At a summer holiday, I draw 6 paintings in the computer by photoshop,
each of them spend me about one day.
One day, my computer suddenly got some problem ,
and I need to format my computer at last.
The 6 paintings then gone forever.

This was a really bad experience, and I thin it is one of the disadventage of digital art.