Hi @pdsqsql ,
You can use the Data Migration Assistant tool to migrate your databases.DMA can migrate multiple databases at once.Please test in the test environment before applying to production.
DMA recommends performance and reliability improvements for your target environment and allows you to move your schema, data, and uncontained objects from your source server to your target server.
https://video2.skills-academy.com/en-us/sql/dma/dma-overview?view=sql-server-ver15
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Hot issues in October—Users always get connection timeout problem when using multi subnet AG via listener. Especially after failover to another subnet