I'm in mission one, and placed all the evidence. The enemies reappered, and I got the order to go to the extraction point. There I saved and quit the game.

Now, after reloading the latest save, I have 3 books to place again!. Can someone please explain how the save system works?

I just finished the tutorial mission and before I saved at the end and reloaded because I wanted to try something different and I had to start all over again. I don't think saves working during mission but might need for someone who has progressed longer to answer that. Pity as I noticed this is a rather non-linear game, you can try different things and I love to experiment, now that becomes diminished if you have to restart the entire mission. :(

Thanks! Yes, I think the developers ought to explain the save system; it does create some frustration. So I should be waiting for a response form the devs before continuing.

Signal Ops has a full save system, so the entire state of the game will be saved. The only exception is the tutorial missions, which are not saved (though it does remember which ones you've completed).

Is it possible you've saved over a different save slot by accident? The only other explanation I can think of would be that the game failed to save; that would probably result in the game crashing completely if it was the case.

Ah, that's good news. Hopefully it was just a one time corruption for Guter then.

Allright, this is what happened:
I removed some older saves (0000-0007), 0008 to 0014 remaining. The game started to create saves 0000 to 0004 again, 0004 is the newest, and contains all my progress.

This is somehow problematic, because the savegame properties on the loading screen don't give you any hint what the newest save might be. You have to find the saves in the windows explorer and look for the date.

Furthermore, what happens when the game reaches the range of existing saves when counting upwards the savegame names?

Hey all,
This is Jakub, the other dev who worked on Signal Ops. You raise some very good points about the save system. Unfortunately I am not the droid you are looking for, as I handle the art-related issues. What I can say, though, is that my colleague will probably be available within the next 2 hours to give you a thorough explanation. Also please consider that within the next few days GOG should be distributing the latest patch, which contains many improvements. Not sure if any save-game related issues are in there, but hey, improvements are always good.

Oh, sounds good. :)

Ah, that makes sense. To name a new save game, it checks if one exists starting at 0000 and counts upwards until it finds that a save does not exist. We had not anticipated players deleting some of the save games.

You can tell which is the latest save by the "Timer" column which records how long the game has been played when the game was saved.

No need to worry about using up all the save slots, it goes up to 99999. If you did have 99999 saves it would save over number 99999 instead.

Well, I'm not sure about this (see my load game screen):
http://666kb.com/i/cf8n1qhzaol8xyrnh.png
Bug or feature?

And is it on purpose that enemies respawn/un-surrender after completing objectives?
Thanks!

Ah, yeah we had another report about the timer not working properly. We will look into the issue.
In the first mission it is actually new enemies that spawn while you are making your getaway, though they will stop to free any arrested friends they find.