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Old 03-03-2015, 08:15 AM   #31
Thermoman
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Quote:
Originally Posted by JeremyBoden View Post
Sorry for my confusion between MB & GB (and KB and MB too).

But I stand by the "ignore read errors" is a crazy thing to do on a backup.
OK. I'll concede that one. I have written myself a memo saying, "Do not copy other peoples' commands until you understand them." If a disk clone is being created then the obvious requirement is that it should fail if an error occurs. I did not at first realize that this is the 'dd' default - but I do now. The best I can claim in my defence is that I am learning from my mistakes. I still find it paradoxical, however, that, if the conv=noerror parameter is used, it causes a fatal error in the cloning process.

Quote:
If you must clone all data, why not just copy the files, because everything (almost) is a file in Linux.
Well, maybe I'm just a lazy cloner at heart. If something goes really amiss I can simply exchange the main hard disk for a clone. If I just want a file or two I can connect the caddy, mount the clone and find the required item(s) in exactly the same place as on the main disk. If, as I earlier conceded, you measure your disk sizes in terabytes then you will probably see things differently but cloning an 80GB disk now only takes 45 minutes, yielding a 'push-button' recovery facility. Maybe I have too many memories of being confronted by the infamous BSOD (blue screen of death, as it was known) and then having to embark on a tedious differential recovery. I am also not too comfortable with that word 'almost' .
 
Old 03-03-2015, 08:27 AM   #32
Thermoman
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Quote:
Originally Posted by Roy.Geer View Post
There is an enhanced version of dd called dcfldd and it's much faster than the standard dd command.
Ooh! I had a quick look at the syntax and got an instant attack of 'newbie's indigestion'.

I'll tell you what; if you would like to try it first, contrasting it with straight 'dd', then I would be very interested in your results.
 
Old 03-03-2015, 08:27 AM   #33
JeremyBoden
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But you have to spot the problem before the next daily(?) backup.
With differential backups I can afford to be more lackadaisical.

BTW If you have to replace your 80GB drive with another, you will not find it easy.
 
Old 03-03-2015, 08:49 AM   #34
Thermoman
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Quote:
Originally Posted by JeremyBoden View Post
But you have to spot the problem before the next daily(?) backup.
With differential backups I can afford to be more lackadaisical.
I have three 80GB disks in caddies that I cycle, enabling me to be a bit lackadaisical, even if not so much as you.

Quote:
BTW If you have to replace your 80GB drive with another, you will not find it easy.
Well it shouldn't be difficult if it's one of the clones. I'll just replace that with another blank 80GB disk which I then introduce into the clone carrousel. If it's a bigger disk then I'll just copy my files - like you do! . Although, come to think of it, surely I will be able to clone one of my 80GB disks to a larger one? I can't imagine going back to a smaller one.

Time to declare a draw, do you think.
 
Old 03-03-2015, 11:04 AM   #35
JeremyBoden
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My PC has 2 x 1TB disks + 750GB NAS-attached offline storage(1) + 2TB USB-attachable offline storage(2).
Plus I run occasional backups using ssh & rsync to a netbook.

You might find products such as Spider Oak useful for storing a few bytes "in the cloud".
 
  


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