That comment is fine. As for how to backup your own......unless you have a really good technical background, I wouldn't worry about it. Here is a link to a picture of a Game Doctor machine that you need to back up the actual ROM off an NES cart to disk. Then there is still a lot of work you have to do to actually make it playable again.
Picture of Backup Machine
There are other machines out there, but this was a popular one. Mainly find them overseas.
--deftech