For what it's worth, I've lost entire days and weeks of work in the past through computer malfunction (and shortsightedness in not backing everything up twice). But I always chose to believe that it was a message from the universe that I could write something even better.
I like your synopsis - sounds very intriguing - and I love that you are going forward with it. Some feedback for your consideration:
Re: the line below:
"One ex-commando with a talent (or annoyance, depending on who’s asked) for losing fingers during heists and two flirtatious robbers who banter as much as they steal, these three are more than capable of surviving the Black Markets of the Solar System."
I would not add parenthetical information about character in the log line. I would also put something about those characters that describes interesting strengths or specialties so the back end of the sentence follows, rather than a guy who is so bumbling (my interpretation) that he loses his fingers regularly, or what sounds like hot girls who talk a lot (again my interpretation, but I am the one reading it. Haha.) In other words, "more than capable" doesn't follow from what you wrote.
Also not clear to me who the "honorable soldiers" are who will become "dishonorable thieves"? At first I thought it was the protagonists (assumed heroes) in the previous line, but you said they are already thieves so is it the current Commandos of the Military who were once honorable and now not?
And I would build out the sentient grenade line a bit more so it relates back to the plot rather than throwing it away with "then there's the matter with..." I think it will only create more interest and depth to bring it back into the whole.
Finally, I love the idea of "black market of the solar system". What you had written about it in a previous post sounded really creative - you might consider building this out a bit too.
That's it. Other than I am excited and proud of you and hope you will let us know how it's going!