ventoy is also quite great

ventoy is extremely janky looking, but rather cool, way to make bootable USB keys. Instead of writing a particular image on to the disk and making it bootable, it boots a generic boot loader that can browse the filesystem on the USB stick, and then chain-boot a bootable-ish .iso file from that filesystem. So! Instead of having a Debian Live CD written to the USB key, I can have Ventoy, then copy in a Debian Live CD, and a GRML live image, etc all on there, and in future update it by just writing a new .iso to the USB key.

I've been putting a USB key with Ventoy and a current Debian Live and GRML image on servers I've sent out in to the real world so I have a convenient last ditch rescue system to reboot from if I need to reinstall or whatever. While a lot of server LOM/iDracs/IPMI consoles can theoretically boot from remote install media, it's usually like "oh yeah, just provide me a SMB server on the same network segment, I can boot from that!", which is not super helpful for me, a "normal" person, with a single server in some distant DC.