Project files vs. database
ETS5 stores all projects as files and does not use a database. It is however not possible to bypass the export/import procedure in order to transfer/copy projects from one PC to another.
Via the general ETS settings it is possible to change the default path for project storage.
ETS also foresees functionality in order to recover project data and to create project backups, the former is called 'restore points' and the latter 'archive', more details here.
Via the general ETS settings it is possible to change the default path for product storage.