How is this different from git clone with --mirror option ?

On Thursday, December 17, 2015 at 9:46:23 PM UTC+5:30, Konstantin Khomoutov 
wrote:
>
> On Thu, 17 Dec 2015 04:40:34 -0800 (PST) 
> mkjke...@gmail.com <javascript:> wrote: 
>
> > I am looking for a mechanism to completely backup my git repository . 
> > The final goal is to take a backup on Tape . I know we have many 
> > alternatives like creation of a git bundle or git archive , 
> > but could you please suggest the best way wherein all references 
> > ( remote branchs, tags ) are also preserved . 
>
>   git init --bare foo.git 
>   cd foo.git 
>   git fetch $source_repo_url 'refs/*:refs/*' 
>
> The last encantation uses the so-called "refspec" which instructs Git 
> to fetch everything from the source repo and re-create the same refs 
> (heads, tags, notes, whatever else there might be) in the local repo. 
>
> The resulting repo can then be backed up to tape. 
>
> If you don't want to re-clone each time, the step (1) should be done 
> only once and the two remaining steps should be repeated before each 
> backup takes place and look like this: 
>
>   cd foo.git 
>   git fetch $source_repo_url '+refs/*:refs/*' 
>
> Notice the '+' char in the "refspec": it tells Git to forcibly replace 
> everything in the local repo which would otherwise produce a conflict. 
>
> If this for some reason might matter to you, you might augment the 
> fetching operation with repacking the repository using 
>
>   git gc --aggressive 
>
> which will move most of the "loose" objects into the so-called "pack 
> files".  On slower filesystems (such as NTFS) this might speed up 
> copying a bit.  But I'm skeptical about whether this would be 
> really noticeable. 
>

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