On Fri, Jun 11, 2021 at 8:38 AM Michael Stowe
<[email protected]> wrote:
> It is worth poking at the contention that "an incremental backup with rsyncd
> unfortunately takes as long as the full backup." This probably isn't true,
> but I can understand how one can believe this after running a single
> incremental backup with rsyncd. How does rsyncd know what to copy
> incrementally? It skips files that are already copied ... of which, there
> are none for your first incremental backup.
If the files are mostly tiny, you can see how rsync's action of
exchanging the directory information needed to determine
existing/changed status would be almost as much work as updating the
files.
> If your *second* incremental backup takes almost as long as the full backup,
> we'll need more details, as your configuration is deviating significantly
> from expectations.
I think I recall something about the third rsync backup getting a
speedup too, where the block checkums are saved on the 2nd run after a
file has been copied. Not sure if that still applies to v4.
--
Les Mikesell
[email protected]
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