When network connectivity to the AWS Region goes down, your database continues to run locally. You cannot create new databases or take new actions on the existing database, automatic backups will also not trigger at that particular interval while connectivity is not available. In the case of database failures, the database will not be automatically replaced until the connectivity is restored. Once connectivity is restored Single-AZ instances will be rebooted. Depending on the circumstances, Multi-AZ instances may perform a failover. We recommend you restore network connectivity as soon as possible.