Explanation/Reference:
Note:
* You can use Windows PowerShell to back up the farm manually or as part of a script that can be run at scheduled intervals.
* The Backup-SPFarmcmdlet creates a backup for the entire farm or individual components within the farm. It can also be used to back up just the configuration settings of a farm to be used as a farm template for other SharePoint farms.
Syntax:
Backup-SPFarm -BackupMethod<String> -Directory <String> [-
AssignmentCollection<SPAssignmentCollection>] [-BackupThreads<Int32>] [- ConfigurationOnly<SwitchParameter>] [-Confirm [<SwitchParameter>]] [-Force <SwitchParameter>] [-Item
<String>] [-Percentage <Int32>] [-WhatIf [<SwitchParameter>]]
* Here we need a full backup, since the farm has not been backed up earlier.
* Item Parameter
Indicates the part of the farm to back up.
Here we should use Farm\Shared Services