Duplicati - Free backup software to store backups online with strong encryption. Works with FTP, SSH, WebDAV, OneDrive, Amazon S3, Google Drive and many others.
Bareos - Bareos Open Source Data Protection - Backup, Archiving & Recovery open Sourced for SUSE, REDHAT, Oracle Linux, Univention, Ubuntu, BSD, AIX, Solaris ... with Plugins for Cloud/S3, NetApp/NDMP, Qumulo, VMware, oVirt/RHV, PostgresQL, MSSQL, ...
Bacula - Bacula is a set of Open Source, enterprise ready, computer programs that permit you (or the system...
UrBackup - UrBackup is a open source client/server backup system, that through a combination of image and file...
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.
Clonezilla - Clonezilla is a suite of software that's designed to allow you to back-up and image new hard drives with your data.