param (
    [Parameter(Mandatory=$true,ParameterSetName='itunesbackups')]
    [int]$iTunesBackups=$false,
    [Parameter(Mandatory=$false,ParameterSetName='itunesbackups')]
    [int]$OlderThan=0)

Function Delete-iTunesBackups($dir) {

    ## Create a new timespan to compare with last write date of the target directory
    $timedelta = New-TimeSpan -Days $OlderThan

    ## Get each iTunes backup directory
    Foreach ( $d in (Get-ChildItem -Path $dir) ) {

        ## If it's older than the number of days specified, recursively delete the directory
        If ( $d.LastWriteTime -lt ((Get-Date) - $timedelta) ) { Remove-Item $d.FullName -Recurse -Force }

    }
}

## Process each user's directory
If ( $iTunesBackups ) {

    ## List of accounts to exclude
    $ExcludedUsers = @("Public",
                       "All Users")

    ## Empty array to hold the user directories to clean
    $DirectoriesToProcess = @()

    ## Get all user accounts in ${Env:SystemDrive}\Users
    $UsersPath = "${Env:SystemDrive}\Users"
    Get-ChildItem -Attributes Directory -Path $UsersPath | ForEach-Object {
        $username = $_.Name
        $path = "${UsersPath}\${username}\AppData\Roaming\Apple Computer\MobileSync\Backup"

        ## Make sure the user isn't excluded and that the iTunes backup directory exists
        If ( ($ExcludedUsers -notcontains $username) -and (Test-Path -PathType Container -Path $path) ) {

            ## Make sure there's data in the iTunes backup folder
            If ( (Get-ChildItem $path | Measure-Object).Count -gt 0 ) {
            
                ## Call the Delete-iTunesBackups function for each directory
                Delete-iTunesBackups $path
            }
        }
    }
}