Hi MichaelChamberlain-1106,
Welcome to Microsoft Q&A.
Microsoft Sync Framework 2.1 does not seem to have an extended support date at this time.
Here is product DotMim.Sync which might help.
In addition, to synchronize database, we can use Always On availability group. The Always On availability groups feature is a high-availability and disaster-recovery solution and supports a replicated environment for a discrete set of user databases. Please refer to What is an Always On availability group which might help.
Best Regards,
Amelia
If the answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.