What is a reliable way to backup/restore my keys and test?

[Robert J. Hansen]

> I am unable to find any references in man to export-local in
> - --export-options except for export-local-sigs.  Maybe this is an
> undocumented parameter to the --export-options option?  What is it
> supposed to do?

--export-local is the same as --export-local-sigs.  Likewise with
--import-local.

I don't use local signatures myself, which is why my process skips those.
But I agree with Daniel that it's important to include those options if you
have local signatures on your keyring.