on the case or with the book that came with the pc is a lable is be blue and white or green and white it should have small words microsoft on it and a string of letters and numbers. acer has a help page on how to find your ser# and oem number on your desktop. also on some desktop and laptops they have a software restore on a partion on the hard drive. using a usb stick or burning a cd you can make a bootable restore cd from it. if not you can call acer and for a few dollars in shipping cost they can send you a restore cd.
The deal is with SSD, is they have very low writes. Very limited compared to conventional HDD, this means you can only write so many times on an SSD. Especially with an operating system like windows which writes a lot. But that is why SSD's are essentially caching the data, not writing it! That is for your HDD.
on pre built system people most times call the vendor and buy a set of restore cd. most new pc have the restore software on a partion on the hard drive..most good sales men will sell a person a pack of dvd disk and tell them the pc at boot will one you to have 4 or 5 dvd disk to make a set of back up disks. if the vendor software does not do that a lot of people use a disk clone or ghost to copy the backup software to disk.