Powershell: code error for replacing character in string

i am VERY new to powershell and i am trying to create a script which will loop through all the subfolders of a folder, then for each sub folder loop through all the files and any which are older than 2 days copy to a new location. Below is the script i have currently but i keep getting an error "Method invocation failed because [System.IO.DirectoryInfo] does not contain a method named 'replace". Does anyone know what have done wrong

$RootFolder = "H:\route\Backup\Full_Backups"
$SubFolders = Get-ChildItem -Path $RootFolder -Directory
Foreach($SubFolder in $SubFolders)
{ 
	$NewPath = $SubFolder.replace('H:\', 'T:\')
	$threshold = (Get-Date).AddDays(-2)
foreach ($SubFolder in Get-ChildItem -LiteralPath $path -Directory) {
  # Construct sub-folder path
  $subPath = Join-Path $SubFolder.FullName "*\js\*"

  # Locate the files at *\js\*
  $files = Get-ChildItem $subPath -Recurse

  # Filter on Creation date
  $files = $files |Where-Object { $_.CreationTime -lt $threshold }

  # Remove files
  $files |Copy-Item -Destination $NewPath -WhatIf
}
}

Awesome, that you are stepping into the world of PowerShell

Here is an optimized version of the script. It gets all files recursively from the $RootFolder that are older than 2 days.
Then those files are copied to the new directory by replacing the drive letter.

$RootFolder = "H:\route\Backup\Full_Backups"

$files = Get-ChildItem -Path $RootFolder -Recurse -File | Where-Object CreationTime -lt $threshold

foreach ($file in $files) {
  $file | Copy-Item -Destination $PSItem.FullName.Replace('H:\', 'T:\')
}

What can be of great help sometimes is the cmdlet "Get-Member". Whenever you have objects at hand, you can always do "| gm", which is the alias for Get-Member. This will show you the object type and all properties and methods an object has.

Your initial problem was, that you tried to do a string replace on an array of objects. By doing the replace on $SubFolders.FullName, you do the replace on the string property of the objects.

Hope that helps!

Have fun with PowerShell!

Per our discussion. This is what should get you to where you need to be.

Condensed Version:

$RootFolder = "H:\SQLServer\Backup\Full_Backups"

(Get-ChildItem $RootFolder -Recurse -File) 
| Where { ((get-date) - ($_.LastWriteTime)) -gt (new-timespan -days 2 -hours 0 -minutes 0) } 
| ForEach-Object -Begin {} -Process { Write-Host "Copying $($_.FullName) to $($_.FullName.Replace("H:\", "T:\"))"; 
Copy-Item -Path ($_.FullName) -Destination ($_.FullName.Replace("H:\", "T:\")) }

Not Condensed:

$RootFolder = "H:\SQLServer\Backup\Full_Backups"

$files = (Get-ChildItem $RootFolder -Recurse -File)


foreach ($f in $files){

if (((get-date) - ($f.LastWriteTime)) -gt (new-timespan -days 2 -hours 0 -minutes 0))
{
$oldpath = $f.FullName

$newPath = ($f.FullName.Replace("H:\", "T:\"))

Write-Host ($f.FullName)

Write-Host $newPath

Copy-Item -Path $oldpath -Destination $newPath
} else {

}
}

Thank you for everyone's help. I have managed to fix it with the below:

$RootFolder = "H:\SQLServer\Backup\Full_Backups"
$subDir = (Get-ChildItem $RootFolder)
foreach($sub in $subDir) {
           $newpath = ($sub.FullName.replace('H:\','T:\'))
           $Source = $sub.FullName
           CD $Source
           Get-ChildItem ".\" -Recurse | Where-Object {($_.LastWriteTime -lt (Get-Date).AddDays(-2))} | Where-Object { $_.Name} | Move-Item -Force -Destination "$newpath\"
}