It just works – Backup compression on TDE databases

There’s not much logic to native database backups in SQL Server – read bits from the data file, write bits to the backup file – so the performance of a backup is essentially a factor of I/O speed.  Back in SQL Server 2008, backup compression was introduced in order to reduce not only the size of backup files, but the amount of I/O generated by a backup operation. By compressing the data before writing it to the backup file, we’re able to reduce the amount of data that gets written to the backup file, which in turn reduces the amount