Save Location[]
Steam\SteamApps\Common\Deus Ex\Save
If playing Revision you also need to check: Steam\steamapps\common\Deus Ex\Revision\Save
And if enabling Biomod also check: Steam\steamapps\common\Deus Ex\Revision\BiomodSave
You can have a few hundred megabytes of saves in the default Deus Ex\Save folder, yet have tens of gigabytes of saves in the other two due to the increased texture sizes.