I just recently started my journey setting up Plex with *Arr and have had a blast. I have the setup running on a raspberry Pi. Before I start buying a bunch of external hard drives, I went searching for some dedicated server hardware to comparison shop. Am I crazy to consider buying an old tower server for this, or will a raspberry Pi work just fine for this purpose? I don’t have that much experience but I do enjoy a good challenge.
Keep in mind SD cards are not generally as durable as SSDs or HDDs, so rpi servers are doable but you should make sure to back it up. Some folks connect SSDs and make the sd card read-only for booting. I haven’t done this myself as I prefer towers.
Also be sure to not let your pi lose power, this can corrupt the sd card.