Without knowing the target market, I'm thinking the taxonomy of "two-way sync" is understood by a very narrow community. ISVs have been using this approach for years. So maybe that's the audience?

If so, then Heroku connect probably does need an alternative.

A business user (non-technical 10x audience) just wants to sleep at night knowing their daily backup was successful and they have recovery capabilities on-demand.

There are unicorn scale companies in this space (such as https://www.owndata.com/). And Salesforce is getting back into the backup game.