Unexpectedly many pipes

[ewxrjk]

rjk@araminta:~$ really lsof -p 15081|grep -c pipe
137
rjk@araminta:~$ ps -ef | grep rsbackup
root     15079 15077  0 10:17 ?        00:00:00 /bin/sh /usr/bin/rsbackup.cron hourly
root     15080 15079  0 10:17 ?        00:00:00 systemd-run --quiet --pipe --slice membound rsbackup --backup
root     15081     1 99 10:17 ?        02:31:08 /usr/bin/rsbackup --backup
rjk      22056 20987  0 12:46 pts/6    00:00:00 grep rsbackup