Files Older Than 3 Months Combined Total File Size

A requirement to identify the total file size of all files not used in the last 3 months.

This was the solution

#Run as administrator
#You need to have permission of the files or folders 

$date = (Get-Date).AddMonths(-3)

dir C:\temp -Recurse | ?{$_.lastwritetime -lt $date -and !$_.PsIsContainer} | Measure-Object -Property Length -Sum

# oneliner

dir C:\temp -Recurse -Force -ErrorAction SilentlyContinue | `

    ?{$_.lastwritetime -lt (Get-Date).AddMonths(-6)} | Measure-Object -Property Length -Sum -ErrorAction SilentlyContinue

 

# resulting data will be in bytes. To convert them to gigabytes, you may do this:

$files = dir C:\temp -Recurse -Force -ErrorAction SilentlyContinue | `

    ?{$_.lastwritetime -lt (Get-Date).AddMonths(-6)} | Measure-Object -Property Length -Sum -ErrorAction SilentlyContinue

($files.sum / 1gb).ToString(“F02”)

# F02 determines how much digits will appears after comma. In my case – 2 digits.

 

dir C:\temp -Recurse | ?{$_.psiscontainer} | %{

    Write-Host current folder is $_.fullname;

    dir $_.fullname | measure-object -property Length -sum -ErrorAction SilentlyContinue

} >c:\temp\file sizes

Credit to the  Original post script this is based on