MySQL Group Replication
MGR – Single master
Master and Slave in different region deployment. It requires a maximum of 10ms network latency.
otherwise, performance goes low more than 50%.
MGR – multi-master
multi-master supposed to apply in data segregation scenarios.
AWS Cross Region replica
AWS supposes cross AZ db replication, as well as cross region backup.
Cross-Region backups are available in all AWS Regions that are available in AWS Backup except Asia Pacific (Hong Kong) and Middle East (Bahrain).