DSM-G600, DNS-3xx and NSA-220 Hack Forum

I have a DSN323 v1.06 with ffp0.5 installed. I also installed the scripts to use Rsync to implement Time Machine like backup functionality on a daily basis. I now want to change the frequency that rsync runs but don't seem to be able to edit the cron table.

The cron jobs are as follows:

# crontab -l
32 2 * * * /usr/sbin/rtc -s
30 2 2 * * /usr/sbin/rtc -c
59 1 * * * /usr/sbin/daylight &
0 2 * * * /ffp/bin/snapshot.sh

When I try to edit the crontab using:

# crontab -e

the same contents show up in what I looks like a vi window but the last line, instead of showing the pathname to the file, shows
a continually highlighted/refreshed message that says

last_modifying_command overrun

I can't do a :q or control-C to get out of this and have to close the telnet window and relogin.

How do I get past this?

Thanks.