PowerShell Script -- Backup

I use a backup tool to backup my servers 4 disk drives. The tool has a command line that is running on schedule in an existing PowerShell script. I want to have the script further enhanced to keep only the last 14 days of incremental backups with one full backup. The script will need to make full backup and incremental backups and remove old backups automatically. The script also send email backup log file data but that is already in existing script.

The following links will assist with understanding the backup tool. http://www.drivesnapshot.de/en/ and http://www.drivesnapshot.de/en/commandline.htm

Also see current script file