Thanks for the hints, that makes sense. Let's see how that can be implemented :)

Proposal:

set system config-management commit-archive uri "stor01z-cs.int.trae32566.org/cr01b-vyos"
set system config-management commit-archive scheme "sftp"
set system config-management commit-archive username "cr01b"
set system config-management commit-archive password "$T3$TP@$$W0^%"

We could improve it by breaking up configuration, having the user providing a URI, Protocol and optional username/password as separate values.
Then we can properly encode username/password. This would also give more flexibility how username/password are handled and passed on.

In both cases it is kind of an user error, the password would have to be properly url encoded if provided in one (@ should be %40 in an URI, a ! should be %21).