Cannot make an incremental backup of VM

[FredK]

I have PBS setup in a 3-node cluster. I have VM and an LXC running there. The LXC makes incremental backups fine but the VM fails after I make the initial full back with the following log -

INFO: starting new backup job: vzdump 400 --storage RPI-backups --mode snapshot --remove 0 --notes-template '{{guestname}}' --notification-mode auto --node rpi-pve1
INFO: Starting Backup of VM 400 (qemu)
INFO: Backup started at 2025-01-18 08:29:03
INFO: status = running
INFO: VM Name: Debian-Desktop
INFO: include disk 'scsi0' 'RPI-storage:400/vm-400-disk-1.qcow2' 64G
INFO: include disk 'efidisk0' 'RPI-storage:400/vm-400-disk-0.qcow2' 64M
INFO: backup mode: snapshot
INFO: ionice priority: 7
INFO: creating Proxmox Backup Server archive 'vm/400/2025-01-18T13:29:03Z'
INFO: issuing guest-agent 'fs-freeze' command
INFO: issuing guest-agent 'fs-thaw' command
ERROR: VM 400 qmp command 'backup' failed - backup register image failed: command error: no previous backup found, cannot do incremental backup
INFO: aborting backup job
INFO: resuming VM again
ERROR: Backup of VM 400 failed - VM 400 qmp command 'backup' failed - backup register image failed: command error: no previous backup found, cannot do incremental backup
INFO: Failed at 2025-01-18 08:29:04
INFO: Backup job finished with errors
TASK ERROR: job errors

For some reason, the backup does not find the full backup of the VM (400) that I just made. The cluster is running the latest version of Proxmox for the arm64.

 

[FredK]

For clarification, our Proxmox backup server is running on our X86 production cluster. The backups are being run from an arm64-based cluster. I can run and restore backups on the arm64 cluster using local storage (not PBS).

 

[Chris]

The cluster is running the latest version of Proxmox for the arm64.

Proxmox VE does not support arm as a platform (at least for now), so how did you set this up? What is your pveversion version --verbose for the PVE hosts? Also, what is the output of proxmox-backup-manager version --verbose for the PBS instance?

 

[FredK]

Also, the initial backup to the PBS server destination, which completes successfully, cannot be restored.

 

[FredK]

Thank you, Chris. The installation process that I used is outlined here -
https://pimylifeup.com/raspberry-pi-proxmox/
https://pimylifeup.com/raspberry-pi-proxmox/

The version for the Raspberry Pi Proxmox nodes is as follows:
# pveversion --verbose

proxmox-ve: 8.3.0 (running kernel: 6.6.62+rpt-rpi-2712)
pve-manager: 8.3.2+port (running version: 8.3.2+port/883af414a9bbd772)
proxmox-kernel-helper: 8.1.0
ceph-fuse: 17.2.7-pve3
corosync: 3.1.7-pve3
criu: 3.17.1-2+deb12u1
glusterfs-client: 10.3-5
ifupdown2: 3.2.0-1+pmx11
libjs-extjs: 7.0.0-5
libknet1: 1.28-pve1
libproxmox-acme-perl: 1.5.1
libproxmox-backup-qemu0: 1.4.1
libproxmox-rs-perl: 0.3.4
libpve-access-control: 8.2.0
libpve-apiclient-perl: 3.3.1
libpve-cluster-api-perl: 8.0.10
libpve-cluster-perl: 8.0.10
libpve-common-perl: 8.2.9+port
libpve-guest-common-perl: 5.1.6
libpve-http-server-perl: 5.1.2
libpve-network-perl: 0.10.0+port
libpve-rs-perl: 0.9.0
libpve-storage-perl: 8.3.3
libspice-server1: 0.15.1-1
lvm2: 2.03.16-2
lxc-pve: 6.0.0-1
lxcfs: 6.0.0-pve2
novnc-pve: 1.4.0-4
proxmox-backup-client: 3.3.0-2
proxmox-backup-file-restore: 3.3.0-2
proxmox-firewall: 0.5.0
proxmox-kernel-helper: 8.1.0
proxmox-mail-forward: 0.2.0
proxmox-mini-journalreader: 1.4.0
proxmox-offline-mirror-helper: 0.6.6
proxmox-widget-toolkit: 4.3.2
pve-cluster: 8.0.10
pve-container: 5.2.2+port1
pve-docs: 8.3.1
pve-edk2-firmware: not correctly installed
pve-firewall: 5.1.0
pve-firmware: not correctly installed
pve-ha-manager: 4.0.6
pve-i18n: 3.2.4
pve-qemu-kvm: 9.2.0-1+port3
pve-xtermjs: 5.3.0-3
qemu-server: 8.3.3+port2
smartmontools: 7.3-pve1
spiceterm: 3.3.0
swtpm: 0.9.0+port
vncterm: 1.8.0
zfsutils-linux: 2.2.6-pve1

I am running Proxmox Backup server in a VM on the main x86 cluster here. The PBS version information is -

Package versions
proxmox-backup: 3.3.0 (running kernel: 6.8.12-4-pve)
proxmox-backup-server: 3.3.0-2 (running version: 3.3.0)
proxmox-kernel-helper: 8.1.0
proxmox-kernel-6.8: 6.8.12-4
proxmox-kernel-6.8.12-4-pve-signed: 6.8.12-4
proxmox-kernel-6.8.12-2-pve-signed: 6.8.12-2
proxmox-kernel-6.5.13-6-pve-signed: 6.5.13-6
proxmox-kernel-6.5: 6.5.13-6proxmox-kernel-6.5.11-6-pve-signed: 6.5.11-6
ifupdown2: 3.2.0-1+pmx11
libjs-extjs: 7.0.0-5
proxmox-backup-docs: 3.3.0-1
proxmox-backup-client: 3.3.0-1
proxmox-mail-forward: 0.3.1
proxmox-mini-journalreader: 1.4.0
proxmox-offline-mirror-helper: 0.6.7
proxmox-widget-toolkit: 4.3.3
pve-xtermjs: 5.3.0-3
smartmontools: 7.3-pve1
zfsutils-linux: 2.2.6-pve1