SSRS Encryption Key backup location I would like to know if there is any metadata table/registry entry where we can find the backup location of SSRS Encryption Key. 

I am working on a power shell report to display the Encryption Key backup date. But the challenge is to find out the location so that the script can be generic.
I could see no answer to this since couple of months. I have done my research and have put together in the below link:
http://sqlgeekspro.com/ssrs-encryption-key-backup-information/