[Apparmor-general] How the link attribute is used?

[S Kalyanasundaram]

Hi, 
 My application takes the backup copy of log files. My application during the startup will take a back of this file /var/log/app/test.log as /var/log/app/test.log~ and create a new version if it. 

I have given /var/log/app/test.log* rw, (application is not creating the backup) So i had given the rwl access and it takes the back up now. So how the link works?

It might be a basic question but i am not getting it. 

thanks for your time,
   -Kalyan