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hippy-
Just had a quick read. They are. I'd take a look and see if you can use LetsEncrypt directly, and then setup it's auto-renew stuff. If not, then it should be ok.
I've tried to do this once, for my mail server on a raspi, but never managed to get all the way though it yet. It's a bit harder to do it for a mail server than for a webpage though.
MrDrem
I thought that LetsEncrypt did that too?