Closed slu-010101 closed 6 months ago
abbbi
commented
6 months ago An Offline backup cannot be used as full backup because if virtual machine is offline no Checkpoint can be created using libvirt api. Checkpoints are mandatory for subsequent incremental or differential backups.
To actually be able to create a full backup, virtual machine must be online.
slu-010101
commented
6 months ago But in this case should never start a backup with auto? And is the first backup healthy, even if the machine was offline?
abbbi
commented
6 months ago But in this case should never start a backup with auto? And is the first backup healthy, even if the machine was offline?
1) if virtual machine is offline and backup mode is "auto" it falls back to backup mode "copy": it at least creates a complete copy backup instead of doing nothing. The backup is healthy. No checkpoint is created because libvirt api refuses to create checkpoint for offline virtual machines.
2) if virtual machine is online and backup mode is "auto" and target directory is empty it can create an checkpoint and then proceeds with a full backup. The checkpoint will track any changes to virtual machine disks and subsequent incremental or differential backups are possible.
its possible to workaround this with pre scripts, check if VM is online if you want a full backup to be created
abbbi
commented
6 months ago See this issue for progress on that topic:
Version used virtnbdbackup --version 2.0
Describe the bug Can't execute switch to auto incremental backup: specified target folder [/mnt/snapshot/2024_12/winABCDEF] does not contain full backup.
Expected behavior If the vm is offline during the first auto backup, the second backup should do nothing because there was no change. Or if it impossible to detect changes backup the complete disk again.
Hypervisor information: Debian 12.5 libvirt-daemon 9.0.0-4
Logfiles: Please attach generated logfiles relevant to the reported issue. virtnbdbackup.log virtnbdbackup_fail.log