Google Cloud Filestore - Fully-managed cloud file storage
Restic - Easy: Doing backups should be a frictionless process, otherwise you are tempted to skip it.
Azure File Storage - Try Azure File Storage for managed file shares that use standard SMB 3.0 protocol. Share data with on-premises and cloud servers, integrate with apps, and more.
Duplicati - Free backup software to store backups online with strong encryption. Works with FTP, SSH, WebDAV, OneDrive, Amazon S3, Google Drive and many others.
Igloo Software - Igloo is a modern intranet, it connects people with the information they need to do their best work.
rsync - rsync is a file transfer program for Unix systems. rsync uses the "rsync algorithm" which provides a very fast method for bringing remote files into sync.