1) Find backup url

Open official Lorcana TCG app and find backup url (see screenshots below). Go to link will let you save text file, in which there is the url.

Home -> 3 dots menu
Collection backup
Backup now
Go to the link

2) Download backup

Lorcana Backup Url:

Download this file and provide it in next step:

3) Export cards

Provide downloaded backup file:
Download:

4) Preview