BIND Zone Files are the most common way to work with zone data in a human-readable format. You may export and import zone file data in this format in the Lightning Wire Labs DNS service.
$ORIGIN example.com $TTL 1800 example.com. 86400 IN SOA ns1.lightningwirelabs.com. test.example.com. ( 1391878516 ; serial 10800 ; refresh time 1800 ; retry time 604800 ; expiry time 1800 ; minimum time ) @ 172800 IN NS ns1.lightningwirelabs.com. @ 172800 IN NS ns2.lightningwirelabs.com. @ 86400 IN MX 10 mail.example.com. mail 86400 IN A 1.2.3.4 mail 86400 IN AAAA 2001:db8::1 www 86400 IN A 1.2.3.4
For your backup purposes, it is possible to export your zones in the BIND zone file format.
Click on the wrench button and pick "Bind Zone File" in the "Export" section.
You may also import zone from BIND zones files.
In the zone manager, click on "Import a zone from a BIND zone file" and paste the zone file.