Proxmox Backup Server 2.2 (released on May 18, 2022) brings multiple enhancements:

• Debian 11.3 (Bullseye), but using a newer Linux kernel 5.15.30
• ZFS 2.1.4
• Namespace feature - for efficient backup management
• Configure sync jobs in datastore GUI
• Easily create and remove namespace
• Maintenance Mode with active operations tracking
• and much more....

View the detailed release notes, including links to the upgrade guides: https://pve.proxmox.com/wiki/Roadmap

For best quality, watch the video in full screen mode (e.g., Firefox, Chrome, ...).

Watch the highlights of Proxmox Backup Server version 1.0 (released November 11, 2020):

• Based on Debian Buster 10.6, with Linux kernel version 5.4 (LTS)
• ZFS 0.8.4
• Proxmox VE is fully supported - easily backup VMs (supporting QEMU dirty bitmaps) and containers.
• Deduplication - avoids redundancy and minimizes the storage space used.
• Incremental backups - Reading and sending only the changes reduces the storage and network impact.
• Ultra-fast Zstandard compression - compress several gigabytes per second.
• Data integrity with SHA-256 checksum algorithm - for accuracy and consistency of your backups.
• Remote synchronization across multiple remote locations
• Encryption on client-side with AES-256 in Galois/Counter mode - very high performance on modern hardware.
• Easy management with web-based user interface & CLI
• Maintenance task scheduling – Advanced scheduling of maintenance tasks, with fine-grained control.
• Support Subscriptions from your Proxmox team
• Open-source license: GNU AGPL, v3

For more details see the release notes: https://pbs.proxmox.com/wiki/index.php/Roadmap

Watch the video in full screen mode for best quality (with chrome, firefox, ...).