I plan to move the forum between 13.4. and 15.4. to a new server. If everything works out as planned, there will be very less downtime.
I will transparently redirect the traffic from the old server to the new one during DNS change.
On the new server HTTPS is possible although the first certificate is probably self signed or from a different domain. But this can be changed afterwards.
All other services like planet, ... will also move to a new server. Probably during the same time.
I will post in this thread is everything is done or anything happens