Thank you. I do not understand where the problem comes from. The properties of the main folder say that there are 62.590 files for 25,85 Go. In the BitTorrent Sync application, only 24158 files are synced (11 Go). The files are not used by another application (at least this is what it seems). The SyncIgnore files is a follows : # .SyncIgnore is a UTF-8 encoded .txt file that helps you specify single files, paths and rules # for ignoring during the synchronization job. It supports "?" and "*" wildcard symbols.### OS generated files #.DS_Store.DS_Store?._*.Spotlight-V100.Trashesehthumbs.dbdesktop.iniThumbs.db Could you please help me solve this issue? Many thanks,