Lost file

[David Carlson]

On 9/27/2011 4:07 PM, Don Quixote de la Mancha wrote:
> On Tue, Sep 27, 2011 at 1:52 PM, Bob Plantz <rgplantz at gmail.com> wrote:
>> the value of a backup = the cost of replacing everything since the last
>> backup
>>
>> I have relearned the true meaning of this equation many times in my life.
>> :-[
> 
> I Got Religion about backup when I lost the third hard drive of my
> career.  To were partial losses, but one was a total loss that sounded
> like the recording head had gotten bent or something.  That drive was
> not at all backed up; I still have it, and may someday pay (a lot!) to
> have  a data recovery service open the can in a clean room so they can
> recover the data for me.
> 
> These days I have a high-end Xeon workstation that runs Fedora.  It
> has a RAID 5 with an AMCC 9690SA SATA/SAS RAID Host Bus Adapter in
> SATA mode.  I have four one-terabyte drives for a total of ~ 2.5 GB of
> usable filesystem space.
> 
> I have not yet automated all of my backup process.  It matters to me
> to be able to find my backed up files years later, so my backups are
> HIGHLY organized.
> 
>  I roll tarballs that are placed in a staging area on my RAID.  It's a
> filesystem on a separate partition, so it's not likely to suffer if my
> main filesystem gets corrupted, but will suffer if I lose two or more
> drives simultaneously.  But it has the advantage of saving me one
> extra trip to my bank's safe deposit box when I swap backup drives.
> 
> I then use rsync to copy the staging filesystem's new contents to one
> of my two one-terabyte backup drives.  These are quality drives, both
> of then Western Digital RAID Edition III drives, a lot fancier than
> one would normally use for a backup, but I figure they are less likely
> to fail.
> 
>  I mount them each in a Wiebetech FireWire/USB/eSATA enclosure
> (http://www.wiebetech.com/).  The Wiebetech enclosures have soft
> rubber shock mounts rather than screwing the drives in an inflexible
> way to the cases.
> 
> Once a week or so I swap the external backup drive on my desk with the
> one in the safe deposit box.
> 
> The use of the internal staging area means that I only need to make
> one trip to the bank each time I swap drives.  If I did not have that
> staging area I would have to backup directly to one of the external
> drives, then I would bring the other drive home, update that drive
> from the previous home drive, then take the previous home drive to the
> bank, making two trips, and also making data loss a little bit more
> likely.
> 
> If you have a fast net connection there are lots of online backup
> services that can be accessed via NFS or Windows filesharing.
> Although my drives and cases had a big up-front expense the amortized
> cost is less than using the online services and wouldn't run into
> trouble in the event or corporate bankrupcy.
> 
> 
I bought a fireproof safe so I don't need to go to the bank.


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