To answer your first question; you can, but if you do, you will have no way to reset it to factory condition. Seeing that it doesn't have a DVD drive, reinstalling from an ISO is out. You could use a bootable USB, but I've not tried it. Although there or those out there that swear by it. As to question #2, this is the problem with a small size SSD. You have to options for this, 1 is to get a larger SSD and transfer old to new. Or see if your laptop has space for a 2nd drive, if so, install a 500 GB HDD and use that for all your data and the SSD for the OS and Office.