Identify Bad Characters in a Table Column

An interesting recursive CTE to list out the non-alphanumeric characters in a column of a table.

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2012-05-08 (first published: 2012-04-12)

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In my SQL Server 2022 database, I run this:

USE Sales;  
GO  
CREATE DATABASE ENCRYPTION KEY  
WITH ALGORITHM = AES_256  
ENCRYPTION BY SERVER CERTIFICATE MyServerCert;  
GO

This works, but I want to prepare for the future and potential issues. How do I back up my DEK?