Hi,

Now that external hard disks are cheap, I'm thinking about getting an
external hard disk so that I can keep a backup of my data. In fact, I'm
even thinking of getting *two* for alternate use so that if the worst
should happen and my system dies while backing up my data I haven't
toasted both my data and my sole backup..

When it comes to external disks, it seems I have the choice of not only
a plain-old hard disk connected via USB, but also the possibility of NAS
(networked-attached storage) where the hard disk is connected to my
network, and contains a stripped-down OS so that it presents itself as a
fileserver (I presume?).

Does anybody know how well-supported either of these technologies are in
Ubuntu? In particular, I'd also want to format the disk in ext3 format
as I have no need or desire for MSWindows filesystems.


On the one hand, NAS seems neat, but I don't have a home network, only a
cheapo multi-port ADSL modem/router. These things tend to be a bit
gnarly (and unfriendly) to set up at the best of times, so I don't know
how easy - let alone whether - it would be possible to set the
modem/router up to allow my computer to see a NAS disk. And given the 
horrible potential for unwittingly sharing the contents of a NAS disk 
with the entire internet, I'd have to be very careful! I gather that it
is generally the case that any configuration of the NAS box can usually
be done via a browser front-end; obviously any disk which requires 
Windows software is a no-no.

On the other hand, a plain-old USB hard disk seems the simpler option. I
would naively assume that as USB is now well-proven technology, these 
would work just fine with Ubuntu, but is that the case? How easy would
it be to automate backups to such a disk? Would it mount with a
persistent mount point, or would it change with every unplug or system 
reboot?


Then there is the question of what backup strategy I should actually
use. I was assuming that an automated rsync every week would be the
easiest, but perhaps there are other possibilities? Something automated,
once configured, without requiring user intervention is an absolute 
must: the whole point of doing backups is that I don't have to remember
to do it!

I mentioned above that having two external hard disks, alternating
between current latest backup and disk being backed-up to, seemed a good
strategy, ensuring that I always have one backup at all times.

Alternatively, perhaps some kind of mirror RAID strategy would be worth
considering, although that would seem to require me to have four hard
disks to maintain my "always one spare backup" strategy (and is outwith
my budget!). I also don't know whether USB HDs or NAS HDs are RAID-able.


Can anybody offer any advice on this?

Thanks,


David.

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