Since Pi's are so cheap.. I like to get one for each project. Bit more investment but if a Pi goes down I don't want to be behind in other projects.

Currently my Pi's are:

-Plex Server
-Pihole with Unbound recursive DNS
-Presearch Node
-Myst VPN Node
-Duino-Coin miner
-RECALBOX retro videogame system
-3 x MotionEYEOS IP camera running on Pi-Zero-Oranges