powershell problem when running on a remote server - access is denied

as a follow up from this question below: Run a PowerShell script on a different server - from inside a SQL Server job there you can see that for me tu run a powershell script from inside a sql server job, I need to create a proxy. Both the powershell script and the proxy script are on that link. what the powershell script does is to delete old backup files on a remote server. the question that I still have is: for the whole thing to work on windows server 2012, I could find not other way than granting Administrator on the remote box to the Proxy account. as you can see on the picture below. another alternative was to create a powershell script that do both, backups and deletes, and create a sql server job with the following code: Is this a powershell limitation when running on a remote server? Are there other ways to work around it, without having to grant admin to the proxy account? PowerShell Basics: Managing Remote Servers & Sessions