On Thu, Sep 9, 2021 at 2:57 AM Amos T <[email protected]> wrote:

> So in that case my a safely assume when borgbackup checks for data
> modification, the
> file in question is not downloaded ?  Because in that case, my backup will
> generate a lot of traffic...
>

The documentation for `borg create` explains the methodologies for
detecting changed files.  Basically, with the defaults, it caches the
metadata of the files it backed up, into a local borg cache.  It doesn't
even need to read anything at all from the destination (s3ql) file system
so long as the cache is intact.  If this cache is lost or corrupt, borg has
to read (download, in the case of s3ql) the entire repository to rebuild
the cache.

-- 
-:-:- David K. Gasaway
-:-:- Email: [email protected]

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