Hello,
I would like to propose an open source backup software named Amanda with free of cost
Amanda is the most popular Backup and Archiving software that protects multiple machines running various versions of Linux, UNIX and Microsoft Windows operating systems. It supports tapes, disks, optical media and changers.
Features
Centralized backups of systems on a network
Intelligent backup scheduler
Open formats for backup archives
Backup Linux, Solaris, Windows, OS X, and most UNIX platforms
Backup to Disk, Tapes, Tape Libraries/Changers or Storage Clouds
Optional Compression and Encryption Built-in
U have to give me a computer or Vm for installing and configuring the Amanda and it will manage your backups
you can integrate NAS or network share to collect these backups
Awaiting for your reply