Years ago when I first started using a computer, we were told and reminded to SAVE our files to our hard disk and to BACK UP our files to some external media. So in my mind there was this image. I finally got around to turning it into a poster, using images from a program for designing greeting cards, posters, banners, etc . For those of you who are not Macintosh, that pretzel shape is the Command key and Command-S is the keyboard shortcut for Save.
This is based on the computer users' joke "Jesus saves and Moses backs up". My poster is not intended to offend anyone's religious sensibilities.