Think about a situation where you are forced to remain in a room for the next 3 years.
And you have a nice 50m2 room/bunker with 2.5 meters in height.
Assuming there isn't any nuclear danger.
You got solarpanels that can produce 5kWh max and a battery that is capable of storing 85kWh
You got a storagesystem that is limited to 5TB in total storage, you can choose the type of media it's stored on. You can use multiple types.
Tanks of sorts (water, waste water, compost, gas,...)can be placed outside the room but you can't access them directly, so you must use pipes to get access to it's content. But also the containers are limited to a size, at max a container can be 2000L

Main things to think about is:
1) Food production/supplies
2) Water filtration
3) Power consumption
4) Comforting enviourment for staying in for 3 years.
5) Assuming there wouldn't be much left of sociaty, try storing some cultural information on your storage system.

Thank you.
I hope you guys appreciate it more than /g/ did.