Hi,
Many thanks for the suggestions.. rsync may be the best fit - I'm glad
to hear the newest version will be less prone to memory issues. I
think the backup footprint will grow quite slowly .. so this should be
an adequate start (hopefully?!)
I'll certainly summarize my findings back to the list..
Thanks again,
Tim
On Wed, Feb 18, 2009 at 11:07 PM, Adam Goryachev
<mailinglists AT websitemanagers.com DOT au> wrote:
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> Tim Chipman wrote:
>> Hi,
>>
>> I was reviewing the recent thread on the topic of "how to make a
>> backup copy of my backupPC server" - ie - for offsite backup
>> redundancy.. and I wanted to see if this is done / doable, given
>> certain circumstances,
>>
>> - second site is 100Mb connection (can get ~10-12megs per second
>> through the network)
>> - replicate copy pushed not too frequently (maybe weekly or monthly)
>> - storage pool size likely to start at ~ hundred gigs and creep up
>> towards a few Tb over time
>> - target storage is accessible via rsync, SSH, or iSCSI even.
>>
>> I wonder, for example, about simply creating a cron job that
>>
>> - mounts the remote iSCSI volume
>> - stops BackupPC from running
>> - uses either cp with -a flag; rsync with -H flag (has memory issues
>> possibly when large data set is being moved?); or possibly better, the
>> script apparently bundled with BackupPC 3.0 and later,
>> "BackupPC_tarPCCopy " (?) to bring a copy of data from the source
>> filesystem to the destination .. ?
>> - once completed, unmount the remote iSCSI filesystem and then bring
>> backupPC back online.
>>
>> Clearly, this has undesirables; such as, copying stuff verbatim rather
>> than doing incremental / differential only transfers if using the
>> tar-based script (?); having to delete the 'offsite copy' prior to
>> putting a new one there, assuming the remote disk isn't big enough to
>> have both the old and the new offsite copies exist at the same time...
>>
>> Any thoughts or comments .. certainly are appreciated.. and I'm sorry
>> if I'm revisiting a old tired familiar query here .. I had trouble
>> getting any hits past the most recent ones on this topic in the forum.
>
> I would suggest using rsync and ensure you have the latest rsync v3 on
> both sides. This should solve the memory problems, and provide the
> incremental advantages. The only problem I could foresee is that the
> time it takes will increase as your number of backups increases, which
> may end up being too long....
>
> The other option I would try, is a enbd block device (the remote end)
> being in a raid1 with the local HDD (raid device). So you have md0 which
> is made up of your 5 local HDD, and then md1 is a raid1 of md0 and the
> enbd device. Then use mdadm to set the enbd as a write-only member.
>
> Please post back to advise how it works out...
>
> Regards,
> Adam
>
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