Adding a second BTRFS SD card

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1

I’m running NextCloudPi on a Raspberry Pi 4, the system is on the main SD card; database, backups etc. on an SD card formatted as BTRFS and plugged into a USB port. I want to move the database onto another device (an M.2 NVMe SSD in a USB adaptor) also formatted as BTRFS, keeping the existing USB SD for backups.
So my question is - how do I format this new drive as BTRFS?

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I ran mkfs.btrfs -L <Label> <device> .
For the data device I decided to usb btrfs because of snapshots, the backup‘s device filesystem is of type ext4.

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Thanks!
(I had to do a umount first and reboot afterwards)