Hi,
What do you mean by "Library"? The Explore view? I understand you have updated your applications to the latest version.
The presets that's availble in the selector in the top of a Arturia application should also be available in the browser.
So it's strange if that's different for you. However you can allways try to delete the db.db3 file in your preset folder. The database rebuild, when you open applications.
I assume you have overwritten the presets you have resaved. Otherwise you might have duplicates now.
If this does'nt work, then i suggest you contact Arturia support.
The only way to secure your files - from whatever can happen even without it's anyones direct fault - is to create backups yourself.