Everything I did in a new Joomla site was gone the next day. I checked and the files of components I installed are still there but the database has no record of them, it's as if the database was restored to right before I made any changes. Does anyone know what happened or how to fix it, if possible?
Maybe someone hacked your site.. I recomand you to just make back-up's of your site. But I have no idea what could be wrong with your site if it wasn't hacked. Maybe you somehow changed database name of password and joomla can't find or enter it?