What I've done with my RPi 4 is attach an external SSD to it and mount it to /home and /var. This reduces writes to the SD card dramatically. Lengthening the SD

What I've done with my RPi 4 is attach an external SSD to it and mount it to /home and /var. This reduces writes to the SD card dramatically. Lengthening the SD card's life. I have serious uptime on it, almost a year (since I got an RPi 4 basically). It only shutdown with power failures (only one, which was entirely my own fault) and system maintenance (OS upgrades and other tinkering). I've also imaged a version of that SD card, so it would be easy to just swap out and probably get things running again without much hassle. I'm sure there are more fancy solutions with overlayfs, making the SD card read-only except for upgrades. Though I couldn't find a nice resource on it at the time.