Server concept

[Viper]

I'll have to do some research for your first question, but for your second there are two possible answers since I'm not sure what you mean...

First:
If the logging indicates "demo discarded" (the logging message upon a demo too short) that would mean they are deleted and do not take up space.

Second: If they just fail to save in general then I would definitely assume they are not saved. xD kinda obvious if you think about it lol.