If you accidentally deleted a folder or file, you can restore the folder or file again so it will be available again.

This is done using the web-client.

Here's a little guide:

1. You will have to go to your web-client and login.  

2. Select the shared folder which contains the deleted items. 

3. Select "Deleted Files" at the top. 

4. Now you will see all the folders/files which has been deleted in this folder.

5. Hold your mouse over the Trashbin icon, and select restore. 

6. Now the file/folder will be accessible again. 

Here's a short how-to video:

See also our solution "Synchronize your files for offline access"