Now, if they only could add a periodic option...
Easily installable via homebrew.
You can mitigate this by having your own domain and host the email on Google Apps -- that way if they take away your access you just update your mx record to point to somewhere else. But you can also easily lose your domain name (due to malice or accident).
BTW, if an emergency does happen, anyone have a recommendation for a decent web email client that I can point my MX record to? Preferably one that has both hosted and self-hosted options. Or something that I can spin up easily on a cloud service such as AWS.
[1] https://squirrelmail.org/about/ [2] https://www.horde.org/apps/webmail
As an aside, VestaCP [3] - an open source hosting admin panel that you can install within a few minutes via ssh - will install squirrelmail automatically:
No backups to deal with and no procrastination-until-the-end-of-your-life. Save the planet and get away from your past.
I happen to like my past and want to keep it, even if I don't habitually refer to it.