|Once the data is secured you can also make a copy onto a folder on a desktop machine so you have additional protection against loss.|
The price of internal hard drives is not that high, even larger SSD drives has come down quite a bit recently so seriously consider replacing the internal drive with a larger one on that laptop machine and cloning over the drive to the new one. Depending on the software the drive company offers free, you may need to later expand the C Drive to the full size of the new drive or add a second partition for storage. This does not free you from having a second copy of all important files for a back up but it makes everything else easier to deal with.
You should always have at least two copies of important files, three if they are critical or irreplaceable.
You have to be a little bit crazy to keep you from going insane.