Sync Steam Library to NAS / Secondary Drive using PowerShell & Robocopy

SyncGamesToNAS.ps1

<# Source game library #>
$dir = dir "D:\Game Libraries\Steam Library\steamapps\common\" | ?{$_.PSISContainer};
<# Mapped network drive / destination path. #>
$nasPath = "G:\Steam Library\steamapps\common";

$log = "E:\gamecopy.log";

Remove-Item $log;

$dir | ForEach-Object {
    <# 
    Have to loop over each directory since we are using /mir. 
    If we rc'd the main directory it would delete games that didn't exist locally.
    #>

    Set-Location $_.FullName;
    <# 
    # Copy options #
    - /e       -- Copies subdirectories. This option automatically includes empty directories.
    - /zb      -- Copies files in restartable mode. If file access is denied, switches to backup mode. This makes it transfer slow, like 1/100 speed.
    - /j       -- Copies using unbuffered I/O (recommended for large files).
    - /timfix  -- Fixes file times on all files, even skipped ones.
    - /mir     -- Mirrors a directory tree (equivalent to /e plus /purge).
    - /mt:64   -- Creates multi-threaded copies with n threads. (64 Threads).
    - /nooffload
    # Retry options #
    - /r:5     -- Specifies the number of retries on failed copies. The default value of n is 1,000,000 (one million retries).
    - /w:5     -- Specifies the wait time between retries, in seconds. The default value of n is 30 (wait time 30 seconds).
    - /tbd     -- Specifies that the system will wait for share names to be defined (retry error 67).
    # Logging options #
    - /np      -- Specifies that the progress of the copying operation (the number of files or directories copied so far) will not be displayed.
    - /log     -- No logging?
    #>
    $name = $_.Name;

    echo "Syncying $name";

    Robocopy.exe $_.FullName "$nasPath\$name" *.* /e /j /timfix /mir /mt:128 /nooffload /r:5 /w:5 /tbd /njh /njs /ndl /nfl /np /nc /ns /log+:$log | Out-Null
}