You’re on the right track and leaps-and-bounds ahead of most with off-site backups.
When you setup a multi-terminal install, configure two terminals with SQL Server, message server, and whatever you need. The stand-by terminal has all services, utilities disabled.
In the event of the server gives up the ghost, the stand-by can have the services enabled and started, a backup restored, then one just has to modify the connection string and message server address on the remaining terminals.
There is a way to setup a SQL Mirror that will auto switch. I started to set that up one day with the developer edition but never finished it. I am pretty sure this is not available with Express editions.
I do recommend you upgrade to latest SQL Server… running 2014 means you cant support JSON and A LOT of sambapos has been upgraded to use JSON since several versions ago. JSON was added to SQL Server in 2016.