AndyChilly

So, I have seen many posts regarding peoples solutions. Only to be followed by the same person later on posting that this method stopped working. From what i see, It seems like a combination of problems. The persistent file corrupting easily and too much going on in the game (debris, flights, flags, saved vehicles) which causes the game to crash.
I only get to play for about 1-2 hours a day on my XBox so I could just be getting lucky. But I would like to add another method to the mix. Actually its not a new method but it seems to be working for me.
I am not holding onto saved ships. once its up and in flight I delete it from storage, in the tracking station I have everything toggled on so I can see everything that the game has to deal with and then terminate what I don't need (this is mostly the ship debris) and ive stopped planting flags for the time being 
Now if i left it like this and the game crashed it would still revert but if i can add some science (no matter how small) and then save the game, exit open up a new game (in order to properly close kerbal down) and then open KSP back up. it then has a new anchor point for any future rollback. This is tedious for those who like to save regularly. Im getting into the habit of opening a game cleaning up all ships and debris and then getting on with a mission that will get me some science back to the space centre and then using this method before it crashes.
Just stay on top of it. after a mission terminate all your debris (clean up after yourself!). minimise that risk of crashing in order to get yourself through a mission and get some science and in my experience you should be able to progress through the game until they sort this mess out!
Addition: I should also add that I do not quicksave throughout the game I just let the autosave do its thing and if I screw up i just go back to last auto save (my own fault for screwing up) this may have some impact on being able to progress.