Hello, I'm using checkpoints to back up Libvirt domains. I'm using the "virsh backup-begin" tool and specifying the dombackup and checkpoint XML files. Everything works correctly (I perform full and incremental backups) without any issues. When I list the checkpoints using the "virsh checkpoint-list DOMAIN --parent --topological" tool, it correctly shows me the entire chain of full and incremental backups. However, when I perform a differential backup, setting the parent of that checkpoint to the last full checkpoint, I have problems when listing them. It tells me that the parent of the differential checkpoint is the last incremental checkpoint, instead of the full checkpoint. And I don't understand why, because when I perform the backup-begin, I specify the full checkpoint in the "incremental" label, and the bitmap generated from the disk is all the data from the full checkpoint on. I put the xmls that I used: FULL BACKUP: dombackup.xml: ``` <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <domainbackup mode="pull"> <server name="localhost" port="10809"/> <disks> <disk name="vda" type="file"> <scratch file="/tmp/libvirt-full-30-vda-debian12.scratch"/> </disk> <disk name="vdb" type="file"> <scratch file="/tmp/libvirt-full-30-vdb-debian12.scratch"/> </disk> </disks> </domainbackup> ``` checkpoint.xml ``` <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <domaincheckpoint> <name>Full-30-Debian12</name> <disks> <disk name="vda" bitmap="Full-30-Debian12" checkpoint="bitmap"/> <disk name="vdb" bitmap="Full-30-Debian12" checkpoint="bitmap"/> <disk name="sda" checkpoint="no"/> </disks> </domaincheckpoint> ``` -------------------------------------------------------- INCREMENTAL BACKUP: dombackup.xml ``` <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <domainbackup mode="pull"> <server name="localhost" port="10809"/> <incremental>Full-30-Debian12</incremental> <disks> <disk name="vda" type="file"> <scratch file="/tmp/libvirt-incremental-35-vda-debian12.scratch"/> </disk> <disk name="vdb" type="file"> <scratch file="/tmp/libvirt-incremental-35-vdb-debian12.scratch"/> </disk> </disks> </domainbackup> ``` checkpoint.xml ``` <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <domaincheckpoint> <name>Incremental-31-Debian12</name> <parent> <name>Full-30-Debian12</name> </parent> <disks> <disk name="vda" bitmap="Incremental-31-Debian12" checkpoint="bitmap"/> <disk name="vdb" bitmap="Incremental-31-Debian12" checkpoint="bitmap"/> <disk name="sda" checkpoint="no"/> </disks> </domaincheckpoint> ``` ----------------------------------------------------------------- DIFFERENTIAL BACKUP: dombackup.xml ``` <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <domainbackup mode="pull"> <server name="localhost" port="10809"/> <incremental>Full-30-Debian12</incremental> <disks> <disk name="vda" type="file"> <scratch file="/tmp/libvirt-differential-36-vda-debian12.scratch"/> </disk> <disk name="vdb" type="file"> <scratch file="/tmp/libvirt-differential-36-vdb-debian12.scratch"/> </disk> </disks> </domainbackup> ``` checkpoint.xml ``` <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <domaincheckpoint> <name>Differential-32-Debian12</name> <parent> <name>Full-30-Debian12</name> </parent> <disks> <disk name="vda" bitmap="Differential-32-Debian12" checkpoint="bitmap"/> <disk name="vdb" bitmap="Differential-32-Debian12" checkpoint="bitmap"/> <disk name="sda" checkpoint="no"/> </disks> </domaincheckpoint> ``` ----------------------------------------------------------------------- After apply several "virsh backup-begin" with these files: ``` virsh checkpoint-list debian12 --topological --parent Name Creation Time Parent -------------------------------------------------------------------------------------------------------------------------------- Full-30-Debian12 2025-07-09 17:08:31 +0200 Incremental-31-Debian12 2025-07-09 17:34:56 +0200 Full-30-Debian12 Differential-32-Debian12 2025-07-09 17:37:51 +0200 Incremental-31-Debian12 ``` I do not know why the parent of "Differential-32-Debian12" is "Incremental-31-Debian12" instead of "Full-30-Debian12". Any ideas?