Amanda vs Proxmox Backup Server

Amanda is a free backup system that lets an administrator protect multiple networked hosts from one master server. It can write backups to disk, tape drives or changers, and cloud storage; bundled drivers cover DVD-RW, RAIT, and Amazon S3. Amanda schedules full and incremental backups and distributes work over the backup cycle. Its catalog tracks files and media locations, helping identify tapes needed for a restore and manage them to avoid overwriting the wrong one. Archives can be compressed before or after network transfer. Security options include OpenSSH for server-client communication, GPG or another encryption program for archives, and Kerberos 5. The Application API supports custom backups for applications such as relational databases and special file systems. Amanda has a native Windows client, and lists Linux, Mac OS X, and Unix client platforms. It is available for Linux, macOS, Windows, and self-hosting. The community edition is free, open source, and provided as-is; the project says it continues to receive critical security updates.

Proxmox Backup Server has no write-up on Specifiction yet; its figures are above.