I use an old Wyse thin client that I picked up from ebay for ~£25. The built in hard drive was something silly like 32Gb so I just boot from an external SSD which gives me 1tb to play with.
Low power, fanless and reliable.
I have it running home assistant, nightly offsite backups from my co-located servers, some uptime monitoring and various other CRONy bits.
My Wyse has served me well for years before I got a rack server, and even today it acts as my fallback server as well as a secondary file backup. I've modified the inside to fit a SATA SSD and have external HDDs connected over USB for file storage.
Low power, fanless and reliable.
I have it running home assistant, nightly offsite backups from my co-located servers, some uptime monitoring and various other CRONy bits.