What is the SyncTrash folder that is automatically created inside Koofr folder?

When files are removed locally during synchronization, they are not deleted but moved into the SyncTrash folder. You can remove files from there whenever you wish if you are sure you do not need them anymore. SyncTrash is the Koofr version of cross-OS compatible Recycle bin. It exists so users can avoid losing files when they accidentally delete something on the server and sync deletes it locally afterwards.

Note: Files from SyncTrash are automatically deleted after 30 days.