Were a liquid what? id doesn't make any sense.
I’m not sure what you’re asking, what about a presentation? Reply back to this and lmk so I can figure it out for ya!!
The most important reason we should make a backup of our files on a USB or other device is in case our computer suddenly dies. If something in it goes bad and it stops working, you will have then lost everything on your computer. But, if you make a save, you can buy another computer and upload everything onto the new one.