How to build a 7-zip archive for maximum cross-platform compatibility?

For what it matters, I’m on Fedora and going to use the solution in a script to create my backups. Hence I want the archive to be accessible on Linux, Android and Windows alike.

From the pieces I gathered, the way is to:

  • Use 7-Zip available on Fedora as 7z.

  • Set the compression method to Deflate as the most universally supported one.

However, 7z man comes with a dead link and I cannot wrap my head around https://documentation.help/7-Zip/method.htm#MethodID

What do they mean by {N}? Could please someone provide an example? Any other suggestions and comments welcome.