Can we backup mailbox audit log? These logs are stored in the recovery folder in each mailbox. Normally it should be backup with mailbox. How can restore and query these logs from after their audit age limit has expired?

Thanks.

Hi Irfan,

Base on my knowledge, you can refer to the following methods to backup audit log:

1. Export mailbox audit logs:

https://technet.microsoft.com/en-us/library/jj150552(v=exchg.150).aspx

2.  Audit logs can be found in the eventviewer under MSExchangeManagement, you can save it, as below:

Best regards,