Checking Backup Encryption Size Differences

Tracy Boggiano has a script to check whether your backup file sizes are larger or smaller when they’re encrypted:

I had a recent project to enable backup encryption on all our servers.  Then question from the storage team came up will this required additional space.  Well by then I had already enabled in all our test servers so I wrote a query that would compare the average size of backups before encryption to after encryption.  Keep in mind we do keep only two weeks of history in our backup tables so this is a fair comparison.  If you don’t have maintenance tasks to clean up your backup history then you should have backup_start_time to the where clauses to get more accurate numbers and setup a maintenance tasks to keep your msdb backup history in check.

Unfortunately, Tracy leaves us in suspense regarding whether they did increase.

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