Re: 2TB USB hard drive for backing up
On Sun, 29 Apr 2012 20:21:52 +0200, Martin Steigerwald wrote:
> Am Dienstag, 24. April 2012 schrieb Camaleón:
>> > While I wait for the new 2 TB HDD, I am copying data across my home
>> > LAN to my laptop which has a 120 GB HDD. I was using the WiFi network
>> > provided by the computer consultants downstairs: it gave me 1.2 MB/s
>> > transfer rate. When I succeeded in getting the Ethernet working, I
>> > got 9 MB/s. I've now checked the ethernet NICs at both ends and they
>> > are both Gigabit devices. So I've ordered a 5m Cat5e ethernet cable
>> > from Amazon which should give me 120 MB/s transfer rate. That would
>> > certainly make it convenient for security backups.
>>
>> Yes, and that's why my primary backup is directly attached to one of
>> the SATA ports of the motherboard: speed between SATA buses is good
>> enough when using a powerful system. The average size of my /home
>> backup is now at ~10 GiB and I always do full (not incremental nor
>> differential) backups becasue 10 GiB is still a manageable size
>> (although for servers and workstations I do differential backups).
>
> I use esata disks for my laptop backups. Together with
> Cardbus-/Expresscard esata controllers, even for the ThinkPad T520 cause
> its Intel only version didn´t sport an esata connector.
>
> SATA flies. A bus where practically possible speeds come quite close to
> the theoretic maximum. Unlike USB 2 and currently it seems also USB 3.
That's another option but again, you need to rely on the ExpressCard
capabilities (v1.2 or v2.0?) and its performance that can slim the whole
throughout.
> Initial rsync based backup of 300 GB Intel SSD 320 to new 2 TB Hitachi
> harddisk has been 1 hour. For about 200 GiB of data, at least one
> million inodes, including a virtual server on the internet and the
> Debian on the USB-Stick in my ASUS WL-500g Premium DSL router.
>
> Current times are usually less than 10 minutes for differential backups.
Well, yes, differential backups shorten the backup process time (though
incremental copies are even faster).
Greetings,
--
Camaleón
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