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Yev from Backblaze here -> ProductHunt is also pretty popular for productivity apps and similar items, though backup may not necessarily fall in to the realm of things folks are used to seeing on those sites. (Edit - formatting)

> Surely a productivity app launch can't be that interesting for news.

This is exactly my challenge: I'm launching a todo list app soon. Thankfully, I have a potentially interesting story to tell:

"Matterlist: an angry Russian writes a 300-page spec, spends 3 years to create a perfect Wunderlist replacement".

I've found reddit to be a questionable place to get customers. Traffic, sure, but customers? Not so much. If you want to spike up your traffic for a few hours, post on reddit. But the conversation rates from reddit traffic are a fraction of the rates coming from other sources, in my experience.

I've read many posts that suggest your same conclusion, however people seem to have very positive things to say about reddit ads in terms of conversion rate.

+1 for ProductHunt and you might try LifeHacker, too.