that's my own directory. yours will be different. you can choose any directory you want, but I assume yours is default, so look in whatever directory it says under applications/backups.
go under app/title id/savedata, then take the img file, open a cmd line, fill out the information for the extract app (do you have it)? you'll have to google for it.
Once again I fell down the martial arts rabbit hole and am plumbing the murky depths of the internet's various martial arts and fighting crafts echo chambers.
If you're not actively involved and only get up to speed every few years or so, you can see the tide of public opinion flapping worse than my dong while I'm skipping naked down a hallway.