Dateien älter als x Tage in userspezifisches Verzeichnis kopieren via Powershell

# Variables  ---------------------------
# Source folder
$basefolder = 'C:\Dateiablage'  
# backup folder
$backupfolder = 'F:\Dateiverschrottung'  
# tracking db file (saves paths of moved files and their time moved, to be able to delete them after the right amount of time)
$trackingdbpath = "$PSScriptRoot\duefiles.db"  
# files oder than this number of days get moved to the backup directory
$duemovedays = -14
# files oder than this number of days are deleted from the backup directory (date of moving in tracking db counts)
$duedeletedays = -14
# ------------------------------------------
# import tracking db to object
if (Test-Path $trackingdbpath){
    $db = Import-CSV $trackingdbpath -Delimiter ";"  
}else{
    $db = @()
}

write-host "Moving old files to backup folder ..." -F Green  
# move files older than $duedays to user specific backup folder
$movedfiles = ls $basefolder -File -Recurse -Force | ?{$_.LastWriteTime -lt (get-date).AddDays($duemovedays)} | %{
    $owner = (get-acl $_.Fullname).Owner.split("\")[-1]  
    $targetfolder = join-path $backupfolder (join-path $owner ($_.DirectoryName -replace [regex]::Escape($basefolder)))
    if (!(Test-Path $targetfolder)){md $targetfolder -Force | out-null}
    try{
        move-item $_.FullName -Destination $targetfolder -Force -Verbose -EA Stop 
        [pscustomobject]@{FullName = (join-path $targetfolder $_.Name); DateTimeMoved = get-date -F u}
    }catch{
        Write-Error -Message $_.Exception.Message
    }
}

# remove empty directories older then duedays in base folder
write-host "Removing old empty directories from source ..." -F Green  
ls $basefolder -Recurse -Directory -Force | ?{$_.LastWriteTime -lt (get-date).AddDays($duemovedays) -and !(ls $_.FullName -Recurse -Force)} | sort {$_.FullName.length} -Descending | del -Recurse -Force -Verbose

# remove due files from backup folder
write-host "Removing old files from backup directory ..." -F Green  
$duefiles = $db | ?{[datetime]$_.DateTimeMoved -lt (get-date).AddDays($duedeletedays)} 
$duefiles | %{del $_.Fullname -Force -EA SilentlyContinue -Verbose}

# update tracking db
# remove removed files from db
if ($db -and $duefiles){
    $db = Compare $db $duefiles -Property FullName,DateTimeMoved -PassThru | select FullName,DateTimeMoved
}
# add new moved files
if ($movedfiles){
    $db += $movedfiles
}
# write back tracking db
if ($db){
    write-host "Updating tracking database." -F Green  
    $db | export-csv $trackingdbpath -Delimiter ";" -NoType -Encoding UTF8  
}
write-host "Finished." -F White -B Blue