I'm a BunnyDNS user and wanted to share a warning - the import from a zone file can drop records silently, and the export will fail to export some of your records. I reported bugs some months ago, they replied they've fixed some but it's still a problem.

Spirit: ensure you keep a good copy of your zone files (bind format), their import / export has issues (it also doesn't include SOA or NS records). I spent time (before the recent fixes) manually validating records.