ALL DATA HAS DISAPPEARED Rated 1 out of 5 stars

Worked fine until today. Everything that I had inserted into Really Simple Sticky is now gone. Disappeared.
It is completely empty. Where was it stored and how can I get it all back?
If it can suddenly disappear then it is not reliable and not worth anything at all. 0 stars.
The "post a comment" on the blog page is not in English.