Hello @gregma and welcome to the forum!
What’s doing that? I hope not Duplicati… Is this job scheduled or run manually? Either way, whenever it next runs it should resume uploads where it left off. Some worry that it looks to be starting over again, but it’s not.
Even though Duplicati is supposed to handle interruptions, trying a test restore would seem like a good idea.
Duplicati has a –number-of-retries option that might help you ride through certain types of network problems, although I’m not sure if it can deal with something that requires a complete do-over from initial authentication.
Continue interrupted backup option mentions some of the design issues which arise from adding the feature.