Hi Bob
I am sure that you would know if you had copies of the photos that you store on the computer.
This is normally done using a DVD / Memory Stick / External Hard Drive / Internet based Cloud ( or similar )
It is generally done manually - it can be automatic - but you would know in either case.
If you are unsure if you have backups, then it would be a good idea - if you cannot afford to lose the photos ( and files ) - to make a copy of the data that you value.
I am not suggesting that we are going to lose it .....this is just a precaution :)
Do you have an external hard drive that you can use ? This is probably the best as it will hold more.
You can use DVDs if you wish. ( or a large Memory Stick )
It is always best to have a copy of important files off the computer just in case of problems.