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.jsonSave a collection
yarn firestore:copy partners/1/items general-partners.jsonSave a document
yarn firestore:copy partners/1/items/000 gdg-lviv-partner.json yarn firestore:copy fileToLoad.json destinationPathLoad to collection
yarn firestore:copy general-partners.json partners/1/itemsLoad a document
yarn firestore:copy gdg-lviv-partner.json partners/1/items/000 yarn firestore:copy sourcePath destinationPathCopy a collection
yarn firestore:copy speakers backups/08-07-2018/speakersCopy a document
yarn firestore:copy speakers/yonatan_levin backups/08-07-2018/speakers/yonatan_levin