Hi syzygist,
Our free plugin only has public support available. If need another option, then we have private paid support available, either via a purchase of UpdraftPlus Premium, or a dedicated support purchase. Where people are using UD for their own paying clients, we certainly appreciate their support to enable us to fund our own activities!
https://updraftplus.com/shop/updraftplus-premium/
https://updraftplus.com/shop/get-support/
Best wishes,
David