SQL Server HA and DR Options: A Field Guide
Log shipping, replication, mirroring, FCIs, and Availability Groups compared: what each protects, sync vs async, failover, editions, and versions.
Can You Actually Downgrade to Standard Edition? Ask the Database First
Since SQL Server 2016 SP1, sys.dm_db_persisted_sku_features over-reports edition features. How to read it before downgrading to Standard.