Exponential back off on autorenew

[DrogoNevets]

Is your feature request related to a problem? Please describe. LetsEncrypt multiple failures cause the user to hit the rate limiter on LetsEncrypt

Describe the solution you'd like Either the ability to turn off auto renew for certificates or exponential backoff after failures

Describe alternatives you've considered Looked to see if i can turn auto renew off easily, but I cant see it

Additional context I keep getting failures on auto renew, i suspect becasue of the ForceSSL bug mentioned elsewhere - but it appears to run every hour without fail. It would be great if I could control if it run at all, and if the auto runs used an exponential back off so as not to litter the logs etc