Lexware Backups strukturiert ablegen und Bericht senden

# Backup folder
$backupFolder = 'E:\Backups'  
# logfile
$logfile = 'E:\backup_purge.log'  
# usual Size of each backup
$usualBackupSize = 500MB
# start logging
Start-Transcript -Path $logfile -Append
# get all backups
$backups = Get-ChildItem $backupFolder -File 
# get backup from today
$today = $backups | ?{$_.CreationTime.Date -eq (get-date).Date} | select -First 1

# prepare purge of old backups (keep some backups)
$keep = @()
# last 14 days
$keep += $backups | ?{$_.CreationTime -ge (get-date).Date.AddDays(-14)}
# last 8 Sundays
$keep += $backups | sort CreationTime -Descending | ?{$_.CreationTime.DayOfWeek -eq [System.DayOfWeek]::Sunday} | select -First 8
# last 24 first of month
$keep += $backups | sort CreationTime -Descending | ?{$_.CreationTime.Day -eq 1} | select -First 24
# filter out backups to purge
$purge = $backups | ?{$_.Fullname -notin $keep} 
# delete old backups
if ($purge){
    $purge | remove-item -Force -Verbose
}else{
    write-host "Nothing to purge."  
}

# define body of report
$body = @"  
BACKUP REPORT
===============
$(if ($today.Count -eq 1 -and $today.Length -gt $usualBackupSize){
    "Current Backup plausible."  
}else{
    "WARNING: Current Backup non existent or unusual size!"  
})

$(if($purge){
    "OLD BACKUPS PURGED:"  
    "-------------------"  
    $purge.Fullname -join "`r`n"  
}else{
    "Nothing to purge."  
})
"@  
# send mail 
Send-MailMessage -From "user@domain.de" -to "empfaenger@domain.de" -Subject "Backup-Report" -SmtpServer smtp.domain.de -UseSSL -body $body  
# stop logging
Stop-Transcript