On 08/17/2014 09:38 PM, John Jason Jordan wrote:
> On Sun, 17 Aug 2014 21:02:47 -0700
>
> I just tried it. The following commands executed without error (both
> drives were already mounted, and the folders in /media had already been
> created)
>
> sudo mount -o remount,rw /dev/sdb2 /media/Home2
> sudo mount -o remount,rw /dev/sdc /media/Movies
>
> But when I try to copy anything from /media/Home2
> to /media/Movies/Backup_8.17.14 it fails because it cannot create
> folders in /media/Movies/Backup_8.17.14 ("permission denied").
>
> i believe the problem is ownership, but if I change the ownership of the
> files in /dev/sdb2 it will be a disaster later.
1. [rant] You should be true root for this to properly work. Not
"sudo" nonsense. A true root user can r/w anything to/from anywhere.
Using sudo you are still in a user shell not a root shell. This can
prevent you from accessing various files. IMHO, this is the greatest
injustice that the *buntus and others have foisted onto the Linux
public. [/rant]
2. Even though you can mount /dev/sdc, you really should not, even if
Linux lets you (mount should kick an error; don't know why it didn't).
That's the *drive* and you should only mount *partitions*. I sure as
heck hope that was just a typo and you didn't format sdc without first
making a partition.
3. "cp -a" is not an appropriate backup tool since its too slow and
stupid. It was never meant to be used for large directory trees.
Thus:
A. Boot your live distro, gain root access.
B. mount your source partition and destination partition somewhere
without automount (or use remount):
mount -o rw /dev/sdb2 /media/Home2
mount -o rw /dev/sdc1 /media/Movies
C.
mkdir -p /media/Movies/Backup_8.17.14 (if it doesn't exist)
rsync -av --progress /media/Home2 /media/Movies/Backup_8.17.14
--exclude={"/media/home2/*/.local/share/Trash/*", "/media/home2/*/.cache/*"}
You may want to add other excludes for any additional junk. This will
create a proper archive backup. rsync is also *way* faster than cp...
-Ed
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