IN AEM WHY backup_.tar files are created

Issue : 

•  AEM Server is taking too long time to stop or not shutting down.

Solution :

• The CRX process should never be killed, also not when stopping takes too long. 
• If you do kill the CRX process, the next time you start it up the Tar PM can create backup_.tar files.

Precaution :

• If you need to kill a process that is not responding, create a full thread dump first.