This is why we strongly urge that identities always be printed out on paper.
Remember back in the 1970’s when computers used punched paper cards and large reels of magnetic tape? If you don’t remember, take our word for it, they once did. More recently, floppy disks were 8 inches in diameter. Those are gone now too. But computers have always printed things out on paper. Of punched card, reel-to-reel computer tape, 8-inch diskettes and paper, which can we easily read today? Only the printed paper. The point is, printed paper is less fancy, but it is the most reliable solution when only a small bit of information needs to be stored and recalled, and where super-speed is not required. And fifty years from now you’ll still be able to read it.
But to answer the question: If you have your SQRL identity on any other device it serves as a redundant backup for all other devices. And if you do not yet have your identity printed out on paper, please stop reading this and go find a printer.