filesystem full - misconfiguration?

I've had rsnapshot running for a little while now and it seems to have 
filled up my fileystem. Perhaps somebody can shed some light on where i 
may have gone wrong (not that the instructions seem /very/ complicated, 
but i seem to have missed something important).

The first hint was finding that my VolGroup00 is at 98%. I immediately 
thought to check my snapshots dir:

[root@apollo snapshots]# rsnapshot du
5.5G    /snapshots/hourly.0/
138M    /snapshots/hourly.1/
120M    /snapshots/hourly.2/
222M    /snapshots/hourly.3/
226M    /snapshots/hourly.4/
90M     /snapshots/hourly.5/
289M    /snapshots/daily.0/
321M    /snapshots/daily.1/
194M    /snapshots/daily.2/
195M    /snapshots/daily.3/
259M    /snapshots/daily.4/
157M    /snapshots/daily.5/
411M    /snapshots/daily.6/
1.6G    /snapshots/weekly.0/
465M    /snapshots/weekly.1/
13G     total

As i understand it, using du through rsnapshot should give a proper 
reading of what's going (given the hard links). But this doesn't look 
right at all. I've certainly not been generating hundreds of Mb of 
changes to the system every day. Either i have a fundamental 
misunderstanding about how rsnapshot works or something's mis-configured 
here.

Side note: i tried getting a diff between snapshots but that didn't work.

[root@apollo snapshots]# rsnapshot diff daily.0 daily.1
Unknown option: daily.0
Please make sure all switches come before commands
(i.e. 'rsnapshot -v hourly', not 'rsnapshot hourly -v')

Here's my config:

config_version  1.2
snapshot_root   /snapshots/
no_create_root  1

cmd_cp          /bin/cp
cmd_rm          /bin/rm
cmd_rsync       /usr/bin/rsync
cmd_ssh         /usr/bin/ssh
cmd_logger      /usr/bin/logger
cmd_du          /usr/bin/du

interval        hourly  6
interval        daily   7
interval        weekly  4
interval        monthly 3

link_dest       1
verbose         2
loglevel        3
logfile         /var/log/rsnapshot

rsync_short_args        -a
rsync_long_args --delete --numeric-ids --relative --delete-excluded
ssh_args        -p 22
du_args -csh
lockfile        /var/run/rsnapshot.pid

backup  /home/          apollo/
backup  /etc/           apollo/
backup  /usr/local/     apollo/
backup  /opt/svn/       apollo/
backup  /var/www/       apollo/
backup  /var/log/       apollo/
backup  /var/lib/       apollo/

My crontab has:

0 */4 * * *       /usr/bin/rsnapshot hourly
0 23 * * *       /usr/bin/rsnapshot daily
0 11 * * 4       /usr/bin/rsnapshot weekly
0 13 1 * *       /usr/bin/rsnapshot monthly


So, can anyone point me in the correct direction on this? And, to free 
up disk space, can i safely just remove all of the snapshots, save for 
daily.0?

brian

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