I have a stock drive from Acer, which came with my G9. I believe it is the dual M2 drives added as raid, so it show as 256 GB, although I can't tell until I unplug the laptop and open the expansion board.
I did find hard time to figure out what is my configuration and slot supported; since Acer has like 10 different variant of the same model (mine is G9-793); so find an exact answer is almost impossible unless someone else has the same configuration and can give me some advice.
I was thinking to replace the 2 M2 drives with either a single 1 TB or 2x512 GB; so I can have a system drive and a secondary drive for applications. The mechanical drive is fine for now as storage.
Also, I am not sure how can I clone the OS. Last time I did this, it was a standard SATA SSD; so I simply plugged the new one as external, and used an application to clone the drive on the new one, and everything was fine. Although I can't see how to connect a M2 drive to my laptop, unless I disconnect the main drive. Do I need an adapter like the SATA->USB adapter but for M2?