> Freezing and archiving the VMs used to build a particular release is also a pretty nice trick.
An essential trick if you have long-lasting products. I've been able to (and asked to!) make fixes in ~2015 to code that was written in Turbo Pascal 6. With firmware for embedded devices it's more necessary and often also harder, because often the hardware to flash the firmware doesn't work with new computers. Or you end up with a chain of USB-Serial adapter to serial-to-weird adapter to "programmer board" to actual device... but I knew that when I carefully packed everything into an antistatic bag 10 years ago :)
An essential trick if you have long-lasting products. I've been able to (and asked to!) make fixes in ~2015 to code that was written in Turbo Pascal 6. With firmware for embedded devices it's more necessary and often also harder, because often the hardware to flash the firmware doesn't work with new computers. Or you end up with a chain of USB-Serial adapter to serial-to-weird adapter to "programmer board" to actual device... but I knew that when I carefully packed everything into an antistatic bag 10 years ago :)