A:Answeri would just buy a usb to ssd adapter, and plug in the old ssd to the adapter to get data off, any time you plug a new ssd or hdd into a computer for the first time, it wipes the drives.
A:AnswerMine included two antennas that attach to the wireless card just below the USB and ethernet ports, yes. If you have two small round jacks on the back that look like miniature coaxial cable jacks, you should have antennas to screw onto them.
A:AnswerThere are 4 SATA ports and 2 additional M.2 SSD slots. There was no way for me to mount the 2.5" SSD that I can see, but behind the GPU there are 2 more slots.