What are the different methods of Database migration to Azure SQL Managed Instances?

Below are the two most common migration strategies that can be leveraged:

Backup and restore

The migration approach leverages SQL backups to Azure blob storage. Backups stored in Azure storage blob can be directly restored into Managed Instance using the T-SQL RESTORE command.

Please refer to below URL for more information:
https://docs.microsoft.com/en-us/azure/sql-database/sql-database-managed-instance-get-started-restore

Data Migration Service

The Azure Database Migration Service is a fully managed service designed to enable seamless migrations from multiple database sources to Azure Data platforms with minimal downtime.

Please refer to below URL for more information:
https://docs.microsoft.com/en-us/azure/dms/tutorial-sql-server-to-managed-instance

Please refer to the below URL for Rhipe’s Data Migration services:
https://www.rhipe.com/services/azure-migration/