Add Compression with TDE backups
When you enable TDE on database in PDW, AU7 it does not compress the backup, this results in double backup size than AU4. We have to enable TDE due to Security requirement as we have some personal information.
There is financial implication an more storage is required and more data to backup to tape. If service is handled by third party, then there is administration cost increased as well.
Native SQL Server 2016 supports backup compression with TDE enabled. It is just matter or enabling as per bellow link: