What is the best way to protect against the loss of important files

Alook-up table used to convert pixel values to output values on a monitor. essentially, all pixels with a value of 190 or above are shown as white (i.e. 255), and all values with a value of 63 or less are shown as black (i.e. 0). in between the pixels are scaled so that a pixel with a value p is converted to a pixel of value 2/127 −+3969). if a pixel has a value of 170 originally, what value will be used to display the pixel on the monitor? if a value of 110 is used to display the pixel on the monitor, what was the original value of the pixel?

Im doing this last minute and literally none of my neighbors or people that my dad works with use excel so if anyone could me make up an example

Why is an outfitting a workspace with video games in a technology development company considered a strategic use of money