Mark Adams wrote at about 16:39:35 -0700 on Wednesday, December 3, 2008:
 > Hi there, me again.
 > 
 > I have several machines I would like to backup with BackupPC, but the 
 > server is a humble box with several installed hard discs -- nothing fancy.
 > 
 > I need to backup each client machine to a different hard drive on the 
 > server.  I have one client configured and it tries to backup my 16 GB of 
 > data, but fails because TopDir is configured for /var/lib/bacuppc in my 
 > /etc/backuppc/config.pl file and there simply isn't enough room for the 
 > data there.  My reading of the docs says that I should be able to 
 > configure TopDir in the client.pl file under 
 > /var/lib/backuppc/pc/<client>/<client>.pl.  I have done this:
 > 
 > # cat /var/lib/backuppc/pc/<client>/<client>.pl
 > $Conf{TopDir} = '/mnt/attic/spike_images';
 > $Conf{XferMethod} = 'rsync';
 > $Conf{BackupFilesExclude} = ['/floppy'];
 > $Conf{BackupFilesOnly} = ['/mnt/spike/images', '/mnt/spike/photos'];
 > $Conf{ClientNameAlias} = '192.168.xxx.xxx';
 > 
 > But it doesn't seem to make any difference. How can I set a TopDir per pc?
 > 

I don't believe it is possible.
Also, since you say you are doing this because you are short of space,
I assume you would like to split TopDir among different
disks/partitions.
But then you would be defeating the ability to pool common files
across machines. If you really want completely separate and
independent TopDirs (including independent pool) then you might as
well run separate setups & copies of BackupPC.

Alternatively, you might want to look into LVM which will allow you to
have a single filesystem spread across multiple disks.

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