Any time if you want to take Data Backup, you can take it. There is no any time boundation or limit for this task. Take data backup as you need and requirement and save it for your future task.
Follow these steps to take Data Backup
Login into your Admin Panel with user id and Password
For Admin Panel click here - http://admin.vktravelapp.com
After login your dashboard is open at your screen. Now click on "Data Backup" app
Now take data backup and save it in your hard drive for further reference.