Avamar Retention

Hello,

Is there a setting to keep a last backup made for a client more than one retention period in case the client itself does not contact the Avamar server for a long time?
For example,the customer has 15 days for daily storage and performs a daily backup.
Would like to know if in the event that the client does not connect to the Avamar server for 20 days, is it possible to keep available for a restore, the last backup made for the client even if the retention has expired?
we know that you can manually change the retention of the backup from the Management tab of the Backup and Restore tab, but we would like it to be automatic.
Thank you very much.
Regards,