About Marshal: Marshal is a free, online tool that scans your cloud services for exposed sensitive data. Once connected, Marshal scans your Box, Dropbox, Google Drive, Microsoft OneDrive, and/or Onehub accounts to uncover exposed Social Security Numbers, credit card numbers, email addresses and phone numbers. Marshal delivers a secure, sanitized report outlining exposed data and whether it is still being shared. Marshal is built by Onehub, a venture-backed startup founded in 2007.