ns1.dnsbackup.net has no CNAME records.
Question and response
Question
dig ns1.dnsbackup.net. NS
Answer
The response has no answer records.
Authority
dnsbackup.net. 10800 SOA ns1.dnsbackup.net. root.dnsbackup.net. 2026030401 86400 7200 1857600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0