Just as a baseline for interested users, I'm listing a few of my 
machines that are backed up with BackupPC, the amount of data, and the 
speed.  My BackupPC box is RAID5, XFS, 3 TB volume, Ubuntu 8.10, 7200 
RPM Seagate ES 1 TB drives, 8 GB of memory, dual Opteron 2216HE 
processors (2.4 GHz) with a Gigabit connection to the network.  All 
connections are over rsync.

Ubuntu Web/Plone Server on same Gb switch:
Full Size: 13.9 GB
Speed: 15.51 MB/s
Time for full backup: 14.9 mins
Type of data: Zope database dump, website files, config files
Core2Duo 2.4 GHz processor, 4 GB memory

Slackware File Server on nearby Gb switch:
Full Size: 182.97 GB
Speed: 23.16 MB/s
Time for full backup: 140 mins (3 hrs, 20 mins)
Type of data: user files, but also some larger files

Windows 2003 R2 fileserver across Gb backbone with data store on Gb 
iSCSI connection
Full Size: 812.3 GB
Speed: 8.47 MB/s
Time for full backup: 1600 mins (26.7 hours)
Type of data: user files, many small files
Dual 3 GHz Xeon processors, 2 GB memory

Windows Vista SP1 Workstation on 100 Mb
Full Size: 40.57 GB
Speed: 15.51 MB/s
Time for full backup: 48 mins
Type of data: user files, many small files
Core2Duo 2.4 GHz, 2 GB memory

Windows 2000 SP4 Server on Gb
Full Size: 12.62 GB
Speed: 17.73 MB/s
Time for full backup: 11.9 mins
Type of data: MS SQL dump, some smaller files

Windows XP SP3 Workstation on 100 Mb
Full Size: 13.29 GB
Speed: 2.91 MB/s
Time for full backup: 76 mins (1 hour, 16 mins)
Type of data: user files, many small files
Single 2 GHz processor, 1 GB memory workstation

Windows XP SP3 Workstation on 100 Mb
Full Size: 7.65 GB
Speed: 6.56 MB/s
Time for full backup: 15 mins
Type of data: user files, many small files
Core2Duo 2.4 GHz processor, 1 GB memory workstation

In general, the Windows XP workstations almost double their speed with 
the dual core processors.  All Linux/Unix servers are markedly faster 
than Windows servers.  The Vista workstation is surprisingly fast 
compared to all other Windows XP boxes.  Type of data does seem to 
matter, as well as processor speed and memory of clients (I see other XP 
workstations with the same specs as the last one in my list but more 
memory that have faster backups and not much varies in terms of types of 
data).

Your network is not my network so please take these numbers as generic 
baselines and not true benchmarks.

Chris

-- 
Christopher Derr . IT
Dept of Land, Air, & Water Resources (LAWR)
University of California, Davis
O: 530-752-2148 . E: cmderr AT ucdavis DOT edu


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