# **************************************************
#    XS-BackupCTXHYV.ps1
#
#    Author: Urs Heeb
#    Create: 27.03.2020
#
#    Note:   Enumerate all VMs, create a snapshot,
#            export the snapshot, and remove it
#
#    Change: 27.03.2020 / uh / Script created
#            28.03.2020 / uh / Script modified for blog
#
# **************************************************

# Import SDK
Import-Module XenServerPSModule

# Define Variables
$Xenhost = "192.168.199.210"
$XenUser = "root"
$XenPW = "PITPassword"
$BkpDate = Get-Date -Format yyyyMMdd-HHmm
$BkpStart = (Get-Date).AddHours(-1) # Subtract one hour for the system time / check with summer time
$BkpTag = "Backup"
$ExportPath = "S:\VM-Backups"


# Connect to Citrix Hypervisor
# Try the defined host otherwise change to new PoolMaster
# --- Base scriptlet from pastebin.com ---

Try {
    $Session = Connect-XenServer -Url https://$Xenhost -UserName $XenUser -Password $XenPW -NoWarnCertificates -SetDefaultSession
    Write-Host -ForegroundColor DarkGreen "Successful connected to $Xenhost"
    }
    Catch [XenAPI.Failure]
        {
        [string]$PoolMaster = $_.Exception.ErrorDescription[1]  
        Write-Host -ForegroundColor Red "$($Pools.$Pool) is slave, Master was identified as $PoolMaster, trying to connect"
        $Pools.Pool = $PoolMaster
        $Session = Connect-XenServer -url "http://$PoolMaster" -UserName $XenUser -Password $XenPW -NoWarnCertificates -SetDefaultSession
        Write-Host -ForegroundColor DarkGreen "Successful connected to $PoolMaster"
       }


# Enumerate all VMs
# --- Base scriptlet from pastebin.com ---
# Added selection of "Backup" Tag

$BkpVMs = Get-XenVM | Where {$_.is_a_template -eq $False -and $_.is_a_snapshot -eq $False -and $_.domid -ne 0 -and $_.tags -contains $BkpTag}


# Create Snapshot of each found VM
# --- Base scriptlet from pastebin.com ---
# Loop added and define the snapshot name based on VM name and date/time of backup start

$BkpVMs | ForEach-Object {
    $VMName = $_.name_label
    $VMUuid = $_.uuid
    $Snapshotname = "$VMName - $BkpDate"
    Write-Host -ForegroundColor Gray "Snapshot with name $Snapshotname for VM $VMName (UUID $VMUuid ) will be created"
    Invoke-XenVM -Uuid $VMUuid -XenAction Snapshot -NewName $Snapshotname
    }


# Enumerate all Snapshots
# --- Base scriptlet from pastebin.com ---
# Only snapshots of VMs with the "Backup" tag and snapshots newer the start time

$BkpVMs2 = Get-XenVM |  Where {$_.is_a_snapshot -eq $True -and $_.tags -contains $BkpTag -and $_.snapshot_time -gt $BkpStart}


# Export the enumerated Snapshots
# --- Base scriptlet from pastebin.com ---

$BkpVMs2 | ForEach {
    $Snapshotname2 = $_.name_label
    $SnapshotUuid2 = $_.uuid
    $ExportFile = "$Exportpath\$Snapshotname2.xva"
    Write-Host -ForegroundColor DarkCyan "Snapshot with name $Snapshotname2 will be exported to $ExportFile"
    Export-XenVm -Uuid $SnapshotUuid2 -XenHost $Xenhost -path "$ExportFile"
    }


# Delete snapshot of each VM which was created before
# --- Base scriptlet from pastebin.com ---
# Loop added to remove all snapshots created before

$BkpVMs2 | ForEach-Object {
    $Snapshotname3 = $_.name_label
    Write-Host -ForegroundColor DarkYellow "Snapshot with name $Snapshotname3 will be deleted"
    Remove-XenVM -Name $Snapshotname3
    }