So I directly modified the content of "%2Fmnt%2Fcache%2FappdataSlot0.cron" as follows,
# Generated snapshot schedule for:/mnt/cache/appdata
0 6-20 * * 1,2,3,4,5, /usr/local/emhttp/plugins/snapshots/include/snapping.php "/mnt/cache/appdata" "0" > /dev/null 2>&1 "
Execute in root@computenode:/boot/config/plugins/snapshots#
/usr/local/sbin/update_cron*
Is this OK?