Just in case you didn't know – you can export all of your posts from G+. Easy as 1, 2, 3! It saves everything as separate HTML pages. Very nicely, in fact.
I liberated mine and plan to share a few older posts on my website. I won't have to do that in future because now I'm using a WordPress plugin called Google+Blog which takes the latest posts and puts them on my blog automatically.
& – I know it doesn't fix what you're looking for G+ to do, but at least your posts are not lost eternally 🙂
Google+: View post on Google+