Here are some things to note about Server Sync / Failover
Server Sync only syncs the live site data. Existing backup files stored on the server, backup schedules and crons are not synced.
Server Sync will not sync custom nginx configuration files in the /etc/nginx/userconfigs folder.
Server Sync will not sync changes to php.ini
The destination server must allow root access. Thus, AWS servers that uses the “ubuntu” user instead of “root” will not work as a destination or source server; neither will Azure, Alibaba or Google Servers.
Server Sync is useful for sites that are primarily ‘brochure’ sites. You should not sync servers with e-Commerce sites, especially those with subscriptions. Otherwise you’re likely to end up with duplicate orders and charges for your customers.