I was trying to install new LED for the door panel light and accidentally burnt the fuse for interior light, i didn't have any spare but I think I remember that all cars should come with some backup fuses, the one i burnt locates at the footwell, but I saw this 7.5 BACKUP in the fuse box under the hood, can I use that one??

 

Look for one marked "spare", might find one in the underhood fusebox.

 

Why not just go buy a variety of fuses? Always good to have them handy.

Backup in the underdash is not a spare.