Proxmox releases Backup Server Version 3.3

1. push synchronization for offsite backups
The synchronization of data between local and external Proxmox Backup Servers can now be done not only by retrieving from the target server (“pull”), but also by actively sending from the source server (“push”). This function is particularly useful if the external server cannot initiate a network connection.

2. support for removable storage datastores
Datastores can now be set up on removable storage media. These so-called “removable datastores” can be easily used between different servers. These storage locations can be mounted and unmounted in an Airgap-friendly manner via the intuitive web interface or the command line.

3. webhook notifications
A new webhook feature makes it possible to trigger notifications such as HTTP requests, for example for synchronization jobs or checking backups. Users can customize requests and content to seamlessly integrate external services.

4. optimized backups for hosts and containers
The detection of unchanged files has been improved, significantly increasing the speed of backups.

5. modernized platform
Proxmox Backup Server 3.3 is based on Debian 12.8 (“Bookworm”) with Linux kernel 6.8.12-4 and offers optional kernel 6.11. In addition, ZFS 2.2.6 is supported with special patches.