Below is how to make mac computers in sync using free software you can use.
How to make mac computers in sync using free software with sync-mac
You can use service from sync-mac.com.
With this service, you can sync your mac to Android device, iOS device, another Mac, mounted device, google account, dropbox, iCloud, MTP device and Microsoft services. Just choose what device you want to sync with.
You can follow below instruction pictures.