Document that only save should make checkpoints
Document that only save should make checkpoints

lmcro/letsencrypt,stweil/letsencrypt,jsha/letsencrypt,letsencrypt/letsencrypt,jtl999/certbot,jsha/letsencrypt,bsmr-misc-forks/letsencrypt,stweil/letsencrypt,jtl999/certbot,lmcro/letsencrypt,letsencrypt/letsencrypt,bsmr-misc-forks/letsencrypt