Irfanview has been my image viewer on Windows for years now. You can install the full plugin pack from the main website (button below the main installer download) and you’ll be set for just about anything that identifies as an image.

(edit) It’s not FOSS though, but it is free.

• Tailscale for external access, this is extremely convenient.
• Namesilo for domain (cheap but otherwise not really recommended)
• Bunny DNS (because NPM’s certbot doesn’t support Namesilo). Still looking at their other services, overall it seems nice.

Still looking at an external backup solution like Backblaze or Hetzner