This can be one of the simplest problems to solve.
First, check to make sure you do not have a backup already. It's possible you used All-In-One WP Migration and have a backup hidden away in Dropbox or locally on your computer.
If not, and you had local backups enabled within GridPane, perform the following steps:
- Create a new site with the same name and on the same server as the old site.
- Open the site configuration modal window and go to the Backups tab.
- In the Restore/Migrate/Clone section, choose Restore and select an available backup.
Voila! Your site is back in business!