Manual:SQLite/Back-up

If your wiki is currently offline, its database can be backed up by simply copying the database file. Otherwise, you should use a maintenance script: php maintenance/SqliteMaintenance.php --backup-to <backup file name>, which will make sure that operation is atomic and there are no inconsistencies. If your database is not really huge and server is not under heavy load, users editing the wiki will notice nothing but a short lag. Users who are just reading will not notice anything in any case.