And sorry for confusion, should have mentioned that I save OFTEN (every few minutes when I complete tasks) but I save on same slot until next day when I start next slot and I also backup the saves on a CD just in case. And it was the first time happening the corruption thing but I deleted corrupted save and reloaded the previous one I played yesterday. Plus I did a story mission to compensate (my game completion status is about 90%). It doesn't matter anymore about the corrupted save, I just managed to re-do the 15 unique jumps that were lost in corrupted save (so far I have done 26 out of 70) so I didn't lost much as I expected. I never save after I get wasted/busted/fail mission.
I always thought it was enough to save daily on each slot but I actually save every often, every time I complete a mission/side-mission/several collectibles or unique jumps/after each successful date, etc.