I am a newbie to Linux and also to BackupPC and have taken much help from
the generous people who support both. I found myself in your position
rather recently and had to work through finding a solution. While some of
the advice may have been good, I may have just lacked the expertise to
implement it! Anyway, let me take a stab at this and I'll also advise you
to talk to several people to ensure you have a good solution and a clear
path to success.
In the Fedora Forum, I was advised to create a soft link at {TopDir}
pointing to my desired target location. I could not get this to work. The
problem that you are facing is that BackupPC requires many inodes and
extensive use of hard links to manage the pool. Hard links won't work
across certain boundaries such as between the Linux system and external
shares. (This is a generalization is not an accurate presentation since my
Linux vocabulary is still working at the baby-talk level.)
What I did was create an LVM storage system. I wanted to dedicate a 500 GB
drive to the BackupPC storage. I set this up as LVM and then mounted it at
{TopDir}. This is working flawlessly for me. Additionally, this structure
will allow me to add additional drives to expand the storage as needed.
Being so ignorant of Linux, I had to depend on good documentation created by
others. I found all that I needed in the following:
i created a raid level 1 array from two hard drives (using mdadm). so
the array is on /dev/md0. this array is mounted onto a third hard
drive where backuppc is running. /etc/fstab:
/dev/md0 /media/raid ext3 defaults 1 2
TopDir is like this:
$Conf{TopDir} = '/media/raid';
when i try to start backuppc i get this:
"Can't create a test hardlink between a file in /media/raid/pc and
/media/raid/cpool. Either these are different file systems, or this
file system doesn't support hardlinks, or these directories don't
exist, or there is a permissions problem, or the file system is out of
inodes or full. Use df, df -i, and ls -ld to check each of these
possibilities. Quitting... "
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