It depends on the size of the SSD, usually they are not that big in size.
Personally I would procure a USB hard disk, a 500 GB-1 TB (should be as low as 50-60 bucks), and make on it a full image of the disk before resetting the device to factory. Then you can mount the image (read only) and copy back whatever file you actually need when (if) you will need it.
This way you don't have the risk to forget (now) to copy this or that file (that will be gone after the reset) and you won't lose the time needed to "hunt" the files.
Conversely, a full image would allow you in the future,