hy does Scanbot use so much Storage even though I deleted all of my documents.
A big amount of storage is taken up by the OCR-Language packs.
To get rid of those files as well, a simple reinstallation of Scanbot will remove them.
(ATTENTION: Please only do this if you are sure that you don't have any scans which have not been synchronized to a cloud storage provider of your choice! This will delete all locally stored documents and there is no way to restore them again!)