Report Server Folder Location

Native mode report server:

C:\Program Files\Microsoft SQL Server\MSRS12.MSSQLSERVER\Reporting Services\ReportServer

Sharepoint mode report server:

C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\15\WebServices\Reporting

Please look into below site:

https://msdn.microsoft.com/en-us/library/ms157273.aspx