Restic - Easy: Doing backups should be a frictionless process, otherwise you are tempted to skip it.

FileHamster - Personal Revision Control - File Hamster - File and Document Revision, Retrieve and Restore

Duplicati - Free backup software to store backups online with strong encryption. Works with FTP, SSH, WebDAV, OneDrive, Amazon S3, Google Drive and many others.

AppleWorks - AppleWorks was office suite by Apple that combined a word processor, a drawing program, a painting...

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.

LBackup - An rsync based backup solution for *NIX based system(s), with a flexible scripting subsystem which...