Backup strategy on Availability groups

Hi :

I have a SQL 2014 Enveronment with Always On availibility group setup. I want tosetup a backup strategy.

I know that the preferred backup database would be the secondart replica.

My backup strategy is something like this.

daily 12am : full backup

daily Transaction Log backups : every 10 min.

My question is.. If I setup up this backup stategy on the secondary database, how would the Transaction logs on the primary database truncate as I am not backing up the primary replica.

What should be the ideal backup strategy for databases in an availability group.

Thank you ..