Re: Poor network backup performance

In both the FD and SD config files, set Maximum Network Buffer Size = 
32768. The default size of 64k is known to cause this issue in Windows, 
or at least certain versions of Windows using certain NICs. You will 
need to restart bacula-sd on the server and bacula-fd on the Windows PC 
before testing.


On 11/21/25 09:55, Phil Pemberton via Bacula-users wrote:
> Hi all,
>
> I've been using Bacula to back up my NAS for some time, and it's been 
> working well. I see effective backup rates of about 30MB/s all told 
> (100MB+ unspooling from SSD to tape, maxing out the LTO6 drive).
>
> Unfortunately when I added my desktop PC to the backup cycle, I found 
> that the effective rate dropped like a rock, to single-digit megabytes 
> per seconds.
>
> The machines are both fairly fast -- the desktop machine (backup 
> source running the FD) is a Ryzen 5 5600X, and the server (with the 
> SAS SSD and tape drive) is an Intel Core i5-9400.
> The network is gigabit end-to-end, and the transfer rates I'm seeing 
> are very poor. Other applications taking the same path are much faster.
>
> Both systems are running Debian derivatives -- the desktop runs Mint 
> with Bacula 13.0.4, and the server runs Ubuntu 24.04 with the same 
> version of Bacula.
>
> Is there anything I can do to improve performance backing up over the 
> network, before I resort to a nightly Rsync from the workstation to 
> the server and backing up from there?
>
> Thanks.

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