visual composer plugin

Hi,

Need advise regarding Visual Composer:

1. The visual composer I’m using stopped working after done some backup with “updraftplus” (I already remove this plugin). The issue now is that I can see Visual Composer functions when edit page but I can’t seem to add any of the functions into the page?

2. I’m thinking to remove the visual composer totally from database and reinstall it, will all the things i have done previously with Visual Composer still be working fine?

3. Please advise where I can find it in the database and which files to delete.

Any other better suggestions…?

Thank you!