There should not be a need for back-up since all content is stored in the cloud accessible via Box.com.
If you would like to do occasional uploads/downloads, you may use Box Desktop app like Box Drive, you may also use the upload/download bottom from the webapp or use FTP.
Since there is no need to back-up contents, what happens when files are moved from one folder to another folder? I'm told moving files corrupts files and therefore was recommended to create a backup of my files.
We have several collaborators in a file and ask them to collaborate via excel online/cloud option - not by downloading the file to prevent data from being stored on their computers. How can we retrieve an earlier copy if one person deletes columns/data from the file? What option do you recommend for backup in this case?