[PowerShell] AWS - Manage Gateway Snapshots

$error.Clear()

$gateway = Get-SGGateway
$volume = Get-SGVolume -GatewayARN $gateway.GatewayARN
$volumeid = $volume.VolumeARN.Substring($volume.VolumeARN.LastIndexOf("/")+1).ToLower()

$filter = New-Object Amazon.EC2.Model.Filter
$filter.Name = "volume-id"
$filter.Value.Add($volumeid)

$today = [DateTime]::Now.Date
$oldTimeSpan = -7
$expiredTimeSpan = -14

$snapshots = Get-EC2Snapshot -Filter $filter

## Get snapshots between 1 and 2 weeks old
$oldSnapshots = $snapshots | Where-Object {$_.StartTime.Date -lt $today.AddDays($oldTimeSpan) -and $_.StartTime.Date -ge $today.AddDays($expiredTimeSpan)}

## Get snapshots older than 2 weeks
$expiredSnapshots = $snapshots | Where-Object {$_.StartTime.Date -lt $today.AddDays($expiredTimeSpan)}

$deleted = New-Object System.Collections.ArrayList
$responses = New-Object System.Collections.ArrayList


## Remove gateway snapshots older than 2 weeks
ForEach($snapshot in $expiredSnapshots){
    Try{
        Remove-EC2Snapshot -SnapshotId $snapshot.SnapshotId -Force
    }
    Catch{
        Continue
    }
    $deleted.Add(($snapshot | Select-Object SnapshotId, StartTime)) | Out-Null
}

## Remove all snapshots except the 6am one for snapshots between 1 and 2 weeks old
ForEach($snapshot in $oldSnapshots){
    If($snapshot.StartTime.TimeOfDay.Hours -le 5 -or $snapshot.StartTime.TimeOfDay.Hours -ge 7){
        Try{
            Remove-EC2Snapshot -SnapshotId $snapshot.SnapshotId -Force
        }
        Catch{
            Continue
        }
        $deleted.Add(($snapshot | Select-Object SnapshotId, StartTime)) | Out-Null
    }
}

$deleted | Export-Csv -Path "C:\Logs\AWS-Snapshots\SnapshotLogDeletions-$($today.Date.ToString("yyyyMMdd")).csv" -NoTypeInformation

If($error){
    $error | Export-Csv -Path "C:\Logs\AWS-Snapshots\SnapshotLogErrors-$($today.Date.ToString("yyyyMMdd")).csv" -NoTypeInformation
}