All systems backup to Synology then to AWS Glacier. Ill check out Backblaze for pricing.
I would keep it only because it is such a pain to study for and take the test. If you can swing 125 every year plus CEs then it is not a heavy lift. These types of certs are good when job hunting for Gov and private business, it can not hurt having it to boost your CV.
PiHole on Pi
Tiny Tiny RSS on Docker behind NGINX reverse proxy on Ubuntu Hosted VPS - Accessed through Tailscale
LinkAce on Docker NGINX reverse proxy on Ubuntu Hosted VPS, Accessed through Tailscale
NextCloud on Pi - Accessed through Tailscale
HomeAssistant on Ubuntu
Calibre running on Ubuntu
Windows Desktops running on Hyper-V Server (Cost and extreme time constraints forced me to setup a Hyper-V server on bare metal, at the time VMWare was not playing nice with Win11 and I did not have the time to troubleshoot).