How to synchronize a folder on a PC and in the cloud somewhere?

Question

Data synchronization

Let's say I'm doing some kind of project, I clicked save and it automatically saves new changes on the cloud either, or not in the cloud, but somewhere else, I just don't know what services there are for this

Answer 1

And what prevents you from using any of the free cloud services (Yandex Disk, Google Drive, Mail Cloud, etc.)?
Each cloud service has its own client for PC. Install it, specify the folder on the PC that you want to synchronize with the cloud, then save your project files in this folder and voila - with any changes to the files, they are automatically synchronized with the cloud.
The same steps can be performed on any other PC and then the current version of the files will be on it too.