Exchange DAG 2010 Transactional Logs Truncation

Exchange DAG 2010 transactional logs truncation not working.

Firstly,Is instant recovery backup same as full backups for Exchange DAG.I need a clarification on Instant Recovey Backup.

Attached is my configuration from the Exchange clients DAG members group for trncation of transactional logs.

Is there anything I am missing please.

Many thanks to the house for all