Plus dd would copy all the unused sectors on the disk

On Jan 27, 2017 10:00 AM, "Matt Graham" <mhgraham@crow202.org> wrote:

> On 2017-01-26 17:05, Eric Oyen wrote:
>
>> why not just use dd and a sufficiently large backup device connected
>> directly to the machine? [...] Basically, I just image the entire
>> device. It's easier to restore that way.
>>
>
> dd is usually not a good way to back things up because of speed.  "dd
> if=/dev/mapper/vg-home of=/dev/disk/by-id/usb-123456 bs=1M" would take 90
> minutes every time it ran because it's transferring 300ishG.  "rsync -av
> --delete-after /home/ /mnt/backup1/home/" usually takes 2-5 minutes because
> it's only transferring the files that have changed, which is usually
> 150-500M or so.
>
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