ns2.dattobackup.com has no NS records.
NS records for this zone are defined at dattobackup.com.
NS records for this zone are defined at dattobackup.com.
Question and response
Question
dig ns2.dattobackup.com. NS
Answer
The response has no answer records.
Authority
dattobackup.com. 3500 SOA ns1.dattobackup.com. dns.dattobackup.com. 2019119007 28800 7200 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0