Backup confusion

[sadams@bigrocksports.com]

Running 6.0.2 on RHEL5 64-bit

I have the following setup in cron for backups:
0 0 * * * /opt/zimbra/bin/zmbackup -del 7d
30 0 * * 6 /opt/zimbra/bin/zmbackup -f -z -a all
30 0 * * 0-5 /opt/zimbra/bin/zmbackup -i -z -a all


However, it looks like I am getting full backups randomly throughout the week.

/opt/zimbra/backup/sessions
[zimbra@webmail sessions]$ ls -lt
drwxr-x--- 6 zimbra zimbra 4096 Nov 18 00:33 incr-20091118.053034.294
drwxr-x--- 6 zimbra zimbra 4096 Nov 17 00:32 full-20091117.053234.359
drwxr-x--- 6 zimbra zimbra 4096 Nov 17 00:32 incr-20091117.053021.156
drwxr-x--- 6 zimbra zimbra 4096 Nov 16 00:31 incr-20091116.053009.369
drwxr-x--- 6 zimbra zimbra 4096 Nov 15 00:32 incr-20091115.053012.278
drwxr-x--- 6 zimbra zimbra 4096 Nov 14 03:36 full-20091114.053009.674
drwxr-x--- 6 zimbra zimbra 4096 Nov 13 00:32 incr-20091113.053013.151
drwxr-x--- 6 zimbra zimbra 4096 Nov 12 00:33 full-20091112.053305.216
drwxr-x--- 6 zimbra zimbra 4096 Nov 12 00:33 incr-20091112.053031.925
drwxr-x--- 6 zimbra zimbra 4096 Nov 11 00:33 incr-20091111.053030.053

Can someone shed some light on why this is happening?

Thanks,
Shannon

[mmorse]

By chance did you add new accounts twice this week? (Check the contents of the fulls that are paired with incrementals, ie: They should be just fulls of those new specific accounts, not fulls in the sense of everyone on the server.)

[sadams@bigrocksports.com]

That was it, thank you.