Well, I don't know if this is redundant information but I'll give it anyhow.
I had a critical error and subsequently a CTD. Went to load game after restart. The whole line for my current campaign had disappeared! The horror, the horror!
After some time of panick and cursing I went to the AACW folder on my harddisk. In the save directory I oppened the last backup folder and copied the files within.I then pasted them in the save folder, outside the backup folders. Back in the game load screen I could to my great relief see the campaign again.
This may be obvious for many but I did it mostly out of desperation not having a clue if it would work or not.
Maybe it can help someone that is computer illiterate as me.