System

FreeFileSync – free and open source data backup software that helps you synchronize files and folders

Grsync – free and open source program for syncing folders, files and creating backups, GTK GUI for rsync

luckyBackup – free and open source, powerful, fast and reliable backup and sync tool

syncBackup – free and open source program for synchronization and backup data (GUI rsync)

Timeshift – free and open source software for creating snapshots of the file system

Deja Dup – free and open source simple backup tool with compression and encryption capabilities from GNOME for Linux

Kup Backup – free and open source tool with automated versioned and synchronized backup type for the Plasma desktop, GUI software bup

Vorta – free and open source, multi-platform desktop backup client for Borg