I made my services account yesterday on Windows, to prepare to move to Linux (first time).
I synced all my data (I waited until sync is done), I closed FF and said goodbye to windows.
After I installed Linux I wanted to restore my data from services on Firefox (all bookmarks, passwords, plugins, history), but FF was unable to download anything. It said that sync is finished but none of the bookmarks or passwords were downloaded.
Is there any history of syncs where I could recover my old profile?
Firefox Sync is not a backup or migration service. It is only for synchronising browser data between two or more devices running Firefox at the same time. If you sync your data to Firefox Sync and then wipe your machine then there is a chance that you will not be able to recover your data.