Exclude AppData from TSM tivoli backups using powershell

TSMAppDataException.ps1

<#
A script to write an exclude file for all users AppData for TSM Tivoli.

Copyright Lars Quentin 2023, licsensed as CC0 (Public Domain)
#>

<#
Configuration Variables:
- BASE_PATH:
  Where the user folders are.
- GLOBAL_REGEX_PATTERN:
  The "Regular Expression" pattern that filters which user folders are relevant.
  If all are relevant, you can use the RegEx "^.*?$".
- OUTPUT_FILE_PATH:
  Where the generated tivoli file should be saved.
  Note that you need to have write access in that parent folder.
#>
$BASE_PATH = "C:\Users\"

# This RegEx matches a string that contains exactly 5 lower- or uppercase letters.
# If numbers are also relevant: "^[a-zA-Z0-9]{5}"
$GLOBAL_REGEX_PATTERN = '^[a-zA-Z]{5}$'

# Match everything.
# $GLOBAL_REGEX_PATTERN = '^.*?$'

$OUTPUT_FILE_PATH = ".\EXCLUDE_LIST.txt"

<# end configuration, begin of program #>

function GetMatchedDirectories {
    param (
        [string]$BasePath,
        [string]$RegexPattern
    )

    $matchedDirectories = Get-ChildItem -Path $BasePath | 
                            Where-Object { $_.PSIsContainer -and $_.Name -match $RegexPattern } | 
                            Where-Object { Test-Path (Join-Path $_.FullName "AppData") } |
                            ForEach-Object { $_.FullName }
    return $matchedDirectories
}

function WriteStringToFile {
    param (
        [string]$MatchedDir
    )

    $stringToWrite = "exclude ${MatchedDir}\AppData"
    Add-Content -Path $OUTPUT_FILE_PATH -Value $stringToWrite
}

function Main {
    $matchedDirs = GetMatchedDirectories -BasePath $BASE_PATH -RegexPattern $GLOBAL_REGEX_PATTERN
    foreach ($dir in $matchedDirs) {
        Write-Host $dir
        WriteStringToFile -MatchedDir $dir
    }
}

Main