It sounds like a different issue if you actually need to re-format the USB and reinstall the containers.
The script only checks if - by any chance - the USB disk/stick has been mounted on the “wrong” slot and if it is, corrects the slot name.
In any case, if you are experiencing USB corruption or in any case for “proper” backup/restore, if it is a “normal” USB stick (normal in the sense of “sized a few GB’s”, or “not a zillion GB’s USB disk/SSD”) it would make IMHO a lot of sense to make a dd-like (sector by sector) image, it is the easiest way to restore the stick to a pristine/initial state, and the image is likely well compressible with zip or gzip. (of course if you have local/physical access to the router and stick)