Just to quickly add to this one, > /dev/null 2>&1 pipes everything to the abyss, which means you'll even lose errors.
you may wish to remove the 2>&1 so you still get emails if there is an error, it may be helpful in the event errors occur, instead of silently failing :).
FYI:
>/dev/null = Pipe standard out to /dev/null
2>&1 = Pipe standard error to standard out, which in turn pipes to /dev/null
so removing 2>&1 means stderr (standard error) will still come through, so you'll get emails in the event of errors, otherwise not.
there are other ways to monitor your systems to ensure errors are picked up quickly, but they vary widely in complexity depending on requirements, so this is a rather simple approach, but can still be effective.
YMMV, but monitoring, logging, trend analysis, etc will help considerably with bug and outage detection, allowing you to maintain higher uptime and business continuity.