Windows Powershell Copy-item only new Files

Hi adrian138 

One way that you could achieve this would be to use a log file that keeps track of a "last runtime" of your delta sync copy and then copying only files that have a creation/last modified time which is greater than the value written to your log file

Here's a sample PowerShell script to get you started:

$sourceDirectory = "C:\Path\to\source\directory"
$destinationDirectory = "C:\Path\to\destination\directory"
$logFile = "C:\Path\to\log\file.txt"

# Check if the log file exists and retrieve last run time
if (Test-Path -Path $logFile) {
    $lastRunTime = Get-Date (Get-Content $logFile)
}
else {
    $lastRunTime = [DateTime]::MinValue
}

# Get files from the source directory
$files = Get-ChildItem $sourceDirectory -File

# Filter only files that have been created or modified since the last run time
$newFiles = $files | Where-Object { $_.CreationTime -gt $lastRunTime -or $_.LastWriteTime -gt $lastRunTime }

# Copy new files to the destination directory
$newFiles | ForEach-Object {
    $destinationPath = Join-Path -Path $destinationDirectory -ChildPath $_.Name
    Copy-Item -Path $_.FullName -Destination $destinationPath
}

# Update the last run time in the log file
(Get-Date).ToString("yyyy-MM-dd HH:mm:ss") | Out-File -FilePath $logFile