Install Proxmox VE 7.x from the ISO (this will delete all data on the existing host).Backup all files in /etc ( required: files in /etc/pve, as well as /etc/passwd, /etc/network/interfaces, /etc/nf, and anything that deviates from a default installation). Backup all VMs and containers to an external storage (see Backup and Restore).See the release notes for breaking (API) changes: New installation In both cases, emptying the browser cache and reloading the GUI are required after the upgrade. An in-place upgrade via apt (step-by-step).A new installation on new hardware (restoring VMs from the backup).In general, there are two ways to upgrade a Proxmox VE 6.x system to Proxmox VE 7.x: In case the system is customized and/or uses additional packages or any other third party repositories/packages, ensure those packages are also upgraded to and compatible with Debian Bullseye. Test the backup beforehand in a test lab setup. Note: A valid and tested backup is always required before starting the upgrade process. Depending on the existing configuration, several manual steps-including some downtime-may be required. You should plan the upgrade carefully, make and verify backups before beginning, and test extensively. Proxmox VE 7.x introduces several new major features.
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