My world has desappeared !

Hello,

I restarted my server about half an hour ago, and saw this: first: I had a new world, completely new. Now, 2 minutes ago, I got an old version, very old, and don't have any new buildings nor installed plugins.

What should I do? I hadn't backed up this world. Please, help! Thanks.

Goldzora, the webinterface is proposing to restore a version created today -sunday-. I need one created yesterday or friday. Is it possible? Sorry, I will try hard asking to you in order to avoid loosing the world I had created.

Thanks anyway!