This is something that has come up multiple times in https://github.com/backdrop/backdrop-issues/issues/2117, as many people believe that the 'site_mail' is a TO address, when in fact, it is meant to be a FROM address.
We do already have one TO address for notifications in core, it's part of the update module and is located at admin/reports/updates/settings as mentioned by @olafgrabienski in this comment.
It has been recommended that we move this setting someplace more global and re-purpose it for other uses, such as: * Update status notifications (also individually configurable) * default TO for the contact module (also individually configurable) * notifications for severe errors in dblog (see https://github.com/backdrop/backdrop-issues/issues/2229) * admin notification on new accounts with pending approval (see https://github.com/backdrop/backdrop-issues/issues/4428) (also maybe will be individually configurable soon?) * other things we have not yet imagined (?)
Recent comments
It's not difficult to write JS code in an admin theme (without a module) that would save text from CKEditor to LocalStorage every X minutes and add a button to restore the text from LocalStorage...
Implementing autosave in Ckeditor 5
Another contrib module came to my mind: Save & Edit. Of course, that's also not what you had in mind - it saves to the server. But it can be helpful when the network the author's...
Implementing autosave in Ckeditor 5
... Autosave module that you mentioned, but it saves to the database I thought, that's what you're after. I am looking for is to save to localStorage...
Implementing autosave in Ckeditor 5