I found my NAS does not have /etc/rc?.d directories as it seems using file-rc.
I see the two services are listed in file runlevel.conf like this
20 0,1,6 2,3,4,5 /etc/init.d/btsync
but most of other services seem set to run at runlevel S.
I also have this output
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root@LG-NAS:/etc# runlevel unknown