I bought from https://www.hystou.com/ not affiliated, bought after the recommendation from a friend). Cannot link to the specific model because they continually update them and it was few years ago, but you can check their Fanless PCs lineup.
I do not have a detailed write up of a setup but shortly: it the latest LTS, installed on built in SSD and attached USB disk is for bulk data - 4TB WD Passport. All important data are stored in encfs over Dropbox so - saves in a cloud continuously and encrypted. Once a month I swap one of the two secondary USB drives and a custom script does a combination of rdiff backups and encrypted zips and the disk is stored offsite. Hopefully one day I will move that script to borg.
Dockers run a bunch of random stuff like tt-rss and airsonic music server where I store a bunch of old and obscure stuff not available on Spotify.
