|Since you want to flip flop the data you will need some third area to store the data.|
There are OEM software. You look at the drive and download that companies software if it exists.
Second might be to use an image. Live linux cd's and floppies can be used. I use g4u because it usually works on older systems. If you have newer ones you can use clonzilla or if you know command line dd or cat or partimage.
Images tend to be either file based or bit by bit. It is not always easy to copy odd OS's by file and when you change drive sizes you may run into issues.
Might be just as easy to leave it as it is.
Playing to the angels
Les Paul (1915-2009)