All data and Files gone Zotero 5.0
When I opened Zotero today all my files were gone and my library was empty. I already checked the Storage "Zotero" and the files on my Computer are still there. When I click Show Data Directory It is showing the right folder. However it doesn't import the files from there. Can anybody help me please?
(Don't try to import or sync anything.)
It should not be possible to see a completely empty library with 5.5MB sqlite
See https://www.zotero.org/support/kb/data_missing_after_zotero_5_upgrade. Do you see a 'zotero' folder in your Firefox profile folder? If so, what files are in it?
On Saturday the 13.01.18 I used a Mac program to clean my Macbook. Maybe that caused the problem? Do you think it would help to reset the computer to an earlier date? I just really need Zotero to work since I'm writing my thesis at the moment...
Zotero creates automatic backups in its data directory named zotero.sqlite.bak and a zotero.sqlite.1.bak, which should date back about 2 days. If you only have the former, it means either you were using a different data directory before yesterday (in which case I'm not sure how you could have folders within 'storage' from earlier) or all the zotero.sqlite* files were deleted sometime before yesterday.
Do you have your data directory in the standard location (/Users/:username/Zotero) or in another location?
Obviously I would strongly recommend using Time Machine with an external drive to automatically back up your computer on a regular basis. You might also consider using Zotero syncing, which would have allowed you to pull down your data from the online library.