Restic - Easy: Doing backups should be a frictionless process, otherwise you are tempted to skip it.
Duplicati - Free backup software to store backups online with strong encryption. Works with FTP, SSH, WebDAV, OneDrive, Amazon S3, Google Drive and many others.
UrBackup - UrBackup is a open source client/server backup system, that through a combination of image and file...
Duplicacy - A new generation cross-platform cloud backup tool
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.
AOMEI Backupper - AOMEI Backupper is a software created to help a person backup, restore, clone, and sync their entire Windows system.