Question: In a database migration from an on - premises data center to the cloud, when might database mirroring be preferable to a backup / restore

In a database migration from an on-premises data center to the cloud, when might database mirroring be preferable to a backup/restore migration method?
Reducing downtime for migration cutover is important
Using a NoSQL database.
Using an open source database.
Synchronous database replication is required.
In a database migration from an on-premises data center to the

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