SFTP (or Secure File Transfer Protocol) is a network protocol that provides file access, file transfer, and file management functionalities over any reliable data stream.
Google Spanner is a Google Cloud-based database system that is ACID compliant, horizontally scalable, and global. Spanner is the database that underpins much of Google’s own data collection, and it has been designed to offer the consistency of a relational database along with the freedom of a non-relational one.