[PVE-User] WG: difference b/w backup types

Alain Péan alain.pean at lpp.polytechnique.fr
Wed Sep 28 17:21:00 CEST 2011


Hi Jeremiah,

Just a question, just to know what is the best policy. Do you use 
BackupPC to backup the image files inside the host, or the files inside 
the VM ? The image files are big files, that change at least slightly 
(logs, updates...), so backupPC needs to backup the whole (big) file 
each time.

If you backup the files inside the VM, you won't backup the files that 
don't change, it is less ressource intensive for your network, but it is 
less easy to restore than an image file...

Alain

Le 28/09/2011 17:12, obj at jltechinc.com a écrit :
> I concur, we use the high-performance, enterprise-grade, openSource 
> *BackupPC* with data-deduplication.
>
> http://backuppc.sourceforge.net/
>
> -Jeremiah
>
> Stefan Sänger said the following on 09/28/2011 11:05 AM:
>> Hi Muhammad,
>>
>> so I see that your case is a bit more production related and harder 
>> to judge. Have you considered other backup solutions?
>>
>> Because I'm not sure if proxmox VM backup is the right choice for 
>> your problem. Basically all it provides is a disk image, and if you 
>> don't take care of backing up these images all that you have left 
>> when you
>> run into problems with your VM is the disk image of the last backup run.
>>
>> It is definitely not the best choice for a reliable backup - if you 
>> run a database and just perform snapshots, you may not be able to 
>> restore tha latest database status.
>>
>> I prefer to look deeper into this and choose a real backup solution
>> to cope with this. That even gives me the possibility to do 
>> incremental backups with regular full backups and weekly kvm disk 
>> images.
>>
>> But of course all that depends on what you are running inside the VM.
>>
>>
>> Stefan
>>
>> On 28.09.2011 16:10, Muhammad Yousuf Khan wrote:
>>>
>>> Thank for the info.well some time backup got failed while copying to 
>>> the
>>> network folder. i have asked this question previously, people have 
>>> their
>>> own perception some say it is because you have 100mbps LAN card  so i
>>> changed it to 1gb and now still having the same problem. so i taught if
>>> i can manage to minimize some process burden during backup that 
>>> would be
>>> fine i can bear 1 or 2 hours down time for a single VM at night when no
>>> one is in office. so that was the reason i asked thus i could minimize
>>> the failure ratio of backup. i am backing up single VM every week and
>>> this is a 4th time that it couldnt copy. therefore i was kinda
>>> troubleshooting also .
>>>
>>> Thank you,
>>>
>>>
>>> On Wed, Sep 28, 2011 at 5:33 PM, Stefan Sänger 
>>> <stsaenger at googlemail.com
>>> <mailto:stsaenger at googlemail.com>> wrote:
>>>
>>>     On 28.09.2011 14:16, Muhammad Yousuf Khan wrote:
>>>
>>>         still not an answer to my question. i already read this
>>>         information on
>>>         wikki. but i wanted to know which one is more faster and low
>>>         resource
>>>         intensive.
>>>
>>>
>>>     Well - there is no general answer to that question, because you 
>>> have
>>>     to consider this with different aspects in mind.
>>>
>>>     So, if you compare these different backup scenarios, obviously
>>>     - snapshot is fastest concerning downtime of your VM, as there is
>>>       virtually no downtime - but it will need the most resources 
>>> since the
>>>       VM itself is running as well as the backup process.
>>>     - suspend and stop need significantly less resources since during
>>>       backup only the bakup task is running
>>>     - stop will need more time than suspend since the VM is shutdown 
>>> before
>>>       performing the backup and afterwards has to boot up again
>>>     - suspend will need little more resources since the VM is not 
>>> shut down
>>>       and hence its status has to be kept in memory during backup
>>>
>>>     But - these conclusions are fairly simple. I really wonder why you
>>>     ask these questions, are you going to start a de3tailed discussion
>>>     on backing up VMs?
>>>
>>>
>>>     Stefan
>>>
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>>>
>>>
>>
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