Migrating from one computer to another - snoozed emails, scheduled emails, etc

Just changed computer & noticed that snoozed emails do not pop up on new computer, nor are scheduled emails sent, unless I open the old computer/mailspring on that computer.

Do we know if snoozed emails are supposed to migrate across? Is there a way to migrate them across, or is there a way of backing them up, in case of loss of computer, so that losing access to old computer would not lose access to the snoozed emails?