Powershell

backup.ps1

cd W3SVC1
$now = Get-Date
$today = $now.Date
$date_groups = Get-ChildItem *.log | where { $_.Length -gt 0 -and $_.LastWriteTime.Date -lt $today } | group { $_.LastWriteTime.Date }
cd ..
foreach($g in $date_groups){
    $date = $g.Values[0]
    $name = "iis_logs-$($date.Year)$($date.Month.ToString("D2"))$($date.Day.ToString("D2"))"
    $files = $g.Group
    $cmd = "7z a -t7z -mx=9 -mmt=4 -sdel $($name) $($files)"
    "Backup $($name)"
    iex $cmd
}