If your using ghost you will need to initially ghost to a dvd/cd's
As long as the system is sound when you make your ghost image,you will not need dells back up anymore.
In my experience if the o/s and install backup from dell is on hdd, it will be on an unknown partition,
If your happy your ghost image is good, I would either delete all partitions including backup ,and then repartition as 2 partitions or ,just delete ntfs partition and create 2 other partitions
Then of course use you ghost image cd/dvd to boot pc