Robocopy wrapper to mirror directory to backup drive. Includes path validation.

Sync-Documents.ps1

#https://social.technet.microsoft.com/wiki/contents/articles/1073.robocopy-and-a-few-examples.aspx
#http://www.luisrocha.net/2008/12/robocopy-error-error-5-0x00000005.html

#Robocopy switches used:
#/MIR - mirror directory structure (including empty) 
#/COPY:DT - excludes copying permissions
#/XA:H - excludes hidden files 
#/W:5 - wait 5 seconds on a failure
#/XJD - exclude junction points

Function Sync-Documents {
param(    
    [Parameter(HelpMessage="Specify the source path to data you wish to copy",Mandatory=$True)]
    [ValidateScript({Test-Path $_ -PathType Container})]
    [string]$SourceDir,
    
    [Parameter(HelpMessage="Specify the destination path of data to be copied to",Mandatory=$True)]
    [System.IO.FileInfo]$DestDir
)    
    robocopy.exe $SourceDir $DestDir /MIR /COPY:DT /XA:H /W:5 /XJD
}

Sync-Documents -SourceDir "C:\Users\$env:username\Documents" -DestDir "W:\My Documents\Documents-Backup"