Sometimes i wonder, if user login and his/her all settings/preference syncing will be ever be possible in LibreOffice or not!

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I am not 100% sure what you question is, but i'll make some guesses:

Q: Is there an option in LO to sync its preferences between installations?
A: No, not in LO itself as far as i am aware (please somebody correct me if i am wrong)

Q: Is it possible to sync LO preferences between installations? And how?
A: Yes, you can sync the whole preference folder with tools like rsync or similar.

Q: Will the documentfondation every provide a sync service?
A: Not very likely ..

Hope that helps.

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Take a look at github.com. It is a free cloud-based version control system through which you can store your libreoffice config directory -- in multiple versions -- and download any of those versions to any device with a web-browser.

Its stated purpose is for the storage of source code, but you can store any files you like there.

The free version creates a publicly accessible repository, but your repository is not published so given the widespread use of github, your repo is a grain of sand.

On the other hand, creating your own git repository on your own computer is fairly trivial if you have technical knowledge.