All Snapshots saved and settings have disappeared

Hi,
Today for no visible reason, no update, no activity, I wanted to add a new snapshot and I have found the snapshot plugin set as fresh install, no more settings, no more saved snapshot (I had almost 270) . It took me a while to set them all and I am desperately looking for a way to recover them all.
Would you help me ? (I have granted you full support)
Thanks