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List:       gentoo-user
Subject:    Re: [gentoo-user] Re: How to move ext4 partition
From:       Frank Steinmetzger <Warp_7 () gmx ! de>
Date:       2023-09-20 22:12:16
Message-ID: ZQtuQDyotLN8r2ss () kern
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Am Wed, Sep 20, 2023 at 10:57:00PM +0100 schrieb Victor Ivanov:

> On Wed, 20 Sept 2023 at 22:29, Grant Edwards <grant.b.edwards@gmail.com> wrote:
> >
> > That depends on how long it takes me to decide on tar vs. rsync and
> > what the appropriate options are.
> 
> I've done this a number of times for various reasons over the last 1-2
> years, most recently a few months ago due to hard drive swap, and I
> find tar works just fine:
> 
> $ tar -cpf /path/to/backup.tar --xattrs --xattrs-include='*.*' -C / .

Does that stop at file system boundaries (because you tar up '/')? I think 
it must be, otherwise you wouldn't use it that way.
But when copying a root file system, out of habit I first bind-mount it in a 
subdirectory and tar/rsync from there instead. This will also make files 
visible which might be hidden under an active mount.

This is not necessary if you do it from a live system, but then you wouldn't 
tar up / in the first place.

> Likewise to extract, but make sure "--xattrs" is present
> 
> Provided backup space isn't an issue, I wouldn't bother with
> compression. It could be a lot quicker too depending on the size of
> your root partition.

Or not, depending on the speed of the backup device. ;-)
LZO compression (or zstd with a low setting) has negligible CPU cost, but 
can lower the file size quite nicely, specially with large binaries or debug 
files.

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