Download all Reports from SSRS reporting server

Install-Module -Name ReportingServicesTools
$sourceRsUri = 'http://reportginserver/Reportserver'
#Declare Proxy so we dont need to connect with every command
$proxy = New-RsWebServiceProxy -ReportServerUri $sourceRsUri

#Output ALL Catalog items to file system
Out-RsFolderContent -Proxy $proxy -RsFolder / -Destination 'c:\Backup_Reports' -Recurse