Some early-2000s HP Pavilion towers apparently came with a recovery CD compartment, which sounds to me like a great idea even in the current age of recovery partitions and cloud images. (Sans CD, of course, but fitting a USB stick somewhere would make sense even on notebooks.) https://archive.org/details/ComputerShopper_April2001/page/n65/mode/1up
@ylitvinenko I sometimes tape one to the inside of the case. :)
@adam The “arcade cabinet documentation” approach.