Comments - Mariabackup Overview
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I am wrong. It WILL work also with Galera, aithout restarting any online databases.
My error was that I overlooked the simple task of setting *both* wsrep_auth AND wsrep_method on the DONOR (And on JOINER I guess, in config file(s))
So: DONOR-MYSQL> SET GLOBAL WSREP_AUTH="username:password" DONOR-MYSQL> SET GLOBAL WSREP_METHOD="maribackup"
Start mariadb on the JOINER node that needs SST running non-blocking. It works fine.
My bad!