Garry Bargsley gives an example of how quickly you can migrate a SQL Server instance:
So in just 1 minute and 34 seconds you have migrated all of the following from one server to another.
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All SP_Configure settings
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Any Custom Error Messages
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Any SQL Credentials
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All Linked Servers
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Database Mail along with Configuration and Profiles and Accounts
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All user objects in System Databases
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All Backup Devices
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Any System Triggers
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All User Databases
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All Logins
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Any Data collectors
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Any Security Audits
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All Endpoints, Policy Management, Resource Governor, Extended Events
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And Finally All SQL Server Agent Jobs, Schedules, Operators, Alerts
These are probably very small databases (as it was a test instance), but dbatools is quite impressive.