If you play through Steam. Locate directory where Steam is installed. Navigate to Userdata folder, there you will find folder with random numbers, in one of thoes there, will be remote folder in there your save files.
Deus Ex: Human Revolution - C:/../Steam/Userdata/(numbers)/28050/remote/.
Missing Link - C:/../Steam/Userdata/(numbers)/201280/remote/.
Something similar. Numbers may be different, but that's where they are.