about 3 years ago - Shurenai - Direct link
7DTD saves are enormous and also reliant upon the world files; In total, even a new save between the save+world it would be near or in excess of 1gb+, and it only grows from there as you play. Steam cloud however has a limit of 1gb flat, and getting to that 1gb requires TFP to pay a lot..so between the two facts, this game is not steam cloud enabled.

As to how to transfer data, you'll find your saves and world files in "C:\Users\\AppData\Roaming\7DaysToDie"; easily accessed by searching "%appdata%" in windows search and selecting the 7DaysToDie folder.

Inside you'll find Generated Worlds, Saves, User Options, and a couple other things. Just transfer this entire folder (\7DaysToDie) to the same location (Roaming\) on your laptop.