Google search “Does <isp name> block port 80”

Many home ISPs block port 80 and 25. You should be able to Google that and confirm. If that’s the case you’ll have to use a different method.

Was running on my original pi b up till I replaced it recently with a pi 4. Was a little slow but worked fine.

I setup a script to backup my lvm volumes with kopia. About to purchase some cloud storage to send it off site. Been running for a while de duplication working great. Encryption working as far as I can tell. The sync to other repo option was the main seller for me.