How to correctly use full and incremental backup of '/velero backup create'?

[lizhifengones]

env: minio + openebs(+ nfs) + velero(v.12) + openes.io/velero-plugin

My data scenario: It cannot be deleted or tampered with, so there will be more and more data.

What I am doing: Back up openebs rwo pvc, including --snapshots-volumes

1. I hope that when using /velero backup create, I can selectively perform full and incremental backup of volume snapshot. Is it completely controlled by the plug-in? I see we provide incremental parameters for velero-plugin-for-microsoft-azure;
2. If the incremental backup is controlled by a plug-in, how is the incremental backup capability of shedule backup implemented? (I realized from many comments that schedule is an incremental backup!)
3. If I execute /velero backup create (new full backup) with <the same prefix name>-<timestamp>, which backup will the next schedule backup be incrementally based on?

[draghuram]

Hi, Can you clarify what type of Velero backup are you doing? Are they snapshots, file system backups, or in case of 1.12, snapshot data mover backups?

[lizhifengones]

I am using csi snapshot of velero-plugin

[sseago]

Note that a velero backup includes kubernetes resources as well as volume data. Kubernetes metadata is never incremental -- that's always full. So regarding incremental backups, that will only apply to volume data. Whether a volume backup is incremental, is a function of the plugin used (if a native snapshot -- i.e. velero-plugin-for-aws, etc.), the CSI driver (if using csi plugin), or the fs backup method (currently we support kopia and restic, and both should generate incremental backups).

This is based on the volume being backed up, not the backup name, etc. It doesn't matter what the backup name is or whether the backup is created by schedule. Backup schedules function much like cron job -- their main purpose is to create backups at certain times. Once created, the schedule is not really relevant to the backup anymore.

[lizhifengones]

One very important question: this is based on the volume being backed up, not the backup name etc.
So when my pv name always remains the same and the plugin uses snapshots, is it always incremental backup and unable to do a full backup again?

If I use schedule for backup, and I have no way to re-trigger the full backup by deleting the shedule and generating a new_name_schedule, when the first backup of the schedule expires, does it mean that I can no longer recover the data? My second new_name_schedule is also meaningless?

More relevant here is about the redundancy of complete backup data.

[lizhifengones]

114M    20231031175950 # velero backup create
114M    20231031180708 # velero backup create
114M    inc-backup-2-20231031102014 # schedule 2
140K    inc-backup-2-20231031103416 # schedule 2
140K    inc-backup-2-20231031103514 # schedule 2
114M    inc-backup-20231031101021 # schedule 1
140K    inc-backup-20231031103426 # schedule 1
140K    inc-backup-20231031103514 # schedule 1

I’m not sure if I misunderstood it. It seems that full backup + additional backup can be implemented from scratch based on different schedule names. This is the function I want. Thank you for your replies.