Data Transfers · Paired devices and plan storage
Can I use iCloud Drive in Data Transfers?
Short answer: iCloud Drive isn't an account you add; it's a folder on your Mac. Pick it with the folder button and copy or sync it like any local folder. Online-only files are downloaded as they're read, which needs space.
iCloud Drive isn't an account you add to Data Transfers — it's a folder on your Mac. Choose it with the folder button like any local folder, and you can copy or sync it to an external drive or a connected cloud account.
Keep in mind that files stored only in iCloud (not downloaded) have to come down to your Mac as they're read, which uses space while the transfer runs. If space is tight, transfer smaller parts at a time.
Related: iCloud and iCloud Photos · Transfer between folders on my Mac