At the moment Firestore admin panel doesn't allow to export/import data from their DB. These scripts allows you to load data on your machine, edit and bring it back. See examples to learn how it works.
yarn firestore:copy sourcePath fileToSave.json
Save a collection
yarn firestore:copy partners/1/items general-partners.json
Save a document
yarn firestore:copy partners/1/items/000 gdg-lviv-partner.json
yarn firestore:copy fileToLoad.json destinationPath
Load to collection
yarn firestore:copy general-partners.json partners/1/items
Load a document
yarn firestore:copy gdg-lviv-partner.json partners/1/items/000
yarn firestore:copy sourcePath destinationPath
Copy a collection
yarn firestore:copy speakers backups/08-07-2018/speakers
Copy a document
yarn firestore:copy speakers/yonatan_levin backups/08-07-2018/speakers/yonatan_levin