Homegroup sync?

Question

Data synchronization

There are 4 computers:

• Desktop. Windows 8. User A/B
  
• A laptop. Windows 8 User A
  
• A laptop. Windows 7 User A
  
• A laptop. Windows 8 User B
  

The whole thing is in the homegroup.
How can you organize the synchronization of user profiles (or at least the main components - documents, desktop, libraries) within a group? Preferably without cloud solutions.
Bonus: How to share everything on all machines? (Advanced sharing for local drives, right?)

Answer 1

After searching, I settled on this option - SyncToy.

Answer 2

For synchronization, you need a constantly running share, where you can redirect part of the profile, as an option - one of the PCs with a large disk.
As I understand it, about sharing resources, it’s easier to share on all PCs / laptops, for example, a completely C / D disk for reading / some folder on R / W