https://support.microsoft.com/en-au/topic/kb4057212-fix-memory-leak-occurs-when-you-back-up-a-database-that-contains-memory-optimized-objects-in-sql-server-2016-d786dfb1-54b2-6160-54a1-47e7c01aa7d1
KB4057212 - FIX: Memory leak occurs when you back up a database that contains memory-optimized...
Fixes an issue in which a memory leak occurs when you back up a database that contains memory-optimized objects in SQL Server 2016.