Re: [PVE-User] Proxmox Backup Server (beta)

[Roland <devzero@web.de>]

wo this is great to hear, thanks !

Am 10.07.20 um 16:15 schrieb Thomas Lamprecht:
> On 10.07.20 16:06, Roland wrote:
>> i think there may be a misunderstanding here or i was not clear enough
>> to express what i meant.
>>
>> i guess in terms of backup storage,  pbs is doing similar to what
>> borgbackup does - so indeed that IS i/o and storage effient , but that
>> refers to the backup target side.
>>
>> but what about the backup source?
>>
>> I was referring to VMware cbt as that is a means of avoiding I/O on the
>> VM storage, i.e. the backup source.
>>
>> afaik, proxmox/kvm does not (yet) have something like that !?
> Proxmox Backup Server and Proxmox VE supports tracking what changed with
> dirty-bitmaps, this avoids reading anything from the storage and sending
> anything over the network that has not changed.
>
>> I you have lot's of terabytes of VM disks, each incremental backup run
>> will hog the VMs storage (the same like full backup).
>>
>> In VMware, this is adressed with "changed block tracking", as a backup
>> agent can determine which blocks of a VMs disks have changed between
>> incremental backups, so it won't need to scan through the whole VMs
>> disks on each differential/incremental backup run.
> see above, we effectively support both - deduplication to reduce target
> storage impact and incremental backups to reduce source storage and
> network impact.
>
> https://pbs.proxmox.com/docs/introduction.html#main-features
>
>> see:
>> https://kb.vmware.com/s/article/1020128
>> https://helpcenter.veeam.com/docs/backup/vsphere/changed_block_tracking.html?ver=100
>>
>> i don't want to criticize proxmox, i think proxmox is fantastic, i just
>> want to know what we get ( and what we don't get).
>>
> No worries, no offense taken ;)
>
> cheers,
> Thomas
>
>