In 2015, GitHub user titanous proposed adding support for more than one instance of the API server. (https://github.com/mattermost/platform/issues/402) It was suggested that it would be added before the 1.0 release, but the issue has since been closed without any changes. Since I didn't see this feature requested in this forum, I thought I would post it so that the community can vote on it.
I work with a team of five, all of whom have personal servers, one of which hosts our Mattermost instance. It would be useful for us if we could host as many as five redundant instances of Mattermost, so that if one of our servers were to go down, we could seamlessly switch to another one without losing messages.