require 'sqlite3'
sdb = SQLite3::Database.new('net-a-porter.sqlite3')
ddb = SQLite3::Database.new('net-a-porter-backup.sqlite3')

b = SQLite3::Backup.new(ddb, 'main', sdb, 'main')

begin
  b.step(1)
end while b.remaining > 0

b.finish