Back up Final Cut Camera videos
It’s important to back up your work and your media consistently.
To back up Final Cut Camera videos, do any of the following:
Transfer media to Final Cut Pro for iPad: In Final Cut Camera, you can wirelessly transfer media to Final Cut Pro on an iPad. Whether the media is transferred automatically in a Live Multicam session or you start a transfer manually, you can monitor, pause, resume, or cancel the transfer. See Transfer media from Final Cut Camera in the Final Cut Pro User Guide for iPad.
Share media: You can share videos from Final Cut Camera to other devices (using AirDrop, Messages, or Mail) or save the videos to iCloud Drive or your photo library. See Share and transfer videos.
Use the Files app to copy media: You can use the Files app to copy your Final Cut Camera videos to iCloud Drive or a connected external SSD. See Where your recorded videos are stored and Organize files and folders in Files in the iPhone User Guide.
Another way to back up videos that you record in Final Cut Camera is to regularly back up your device to iCloud or to a computer. See Back up iPhone in the iPhone User Guide.
Tip: If you use iCloud Backup, media in Final Cut Camera is backed up by default. If you don’t want large media files to be included in iCloud backups, you can turn off iCloud Backup for Final Cut Camera. Go to the Settings app 
on your iPhone or iPad, tap your name, then tap iCloud. Tap iCloud Backup, tap the name of your device, then turn off Final Cut Camera. See the Apple Support article What does iCloud back up?