You will need the following if you want to sharpen a small back saw like I do.
Bahco 4-188-05-2-0 Saw File XX Slim (12-15 tpi) 125mm
Saw Setting Pliers, I have Somax 250, I'm sure the Spear and Jackson is just as good. Video to follow on modifying them to suit finer teeth.
A Mill file or a long flat file of some description.
If you have a nice new saw, all you should need is the saw file as the teeth will likely only need a tickle.
28 ноя 2022