Yea, ok. So I work often with my MacBook and on it the space is very limitted. At the moment I have for example a folder with all my stuff from my studies/science and it grows from day to day. I sync the whole folder with syncthing to my NAS at home. I don't want to delete some part of this folder on my Laptop, because allways when I delete a part, you can be shure that in the next days you need it again.
So it would be cool to have the whole folder synced with syncthing, but the files which are not used often are only on the NAS and are synced with syncthing only, when I need them. Like the cash and RAM in a processor.
What do you think, would it be possible to realize something like that?
The same thing does icloud, as I heard.