Disk Space Plus Cloud

Let’s say a flash drive size is 8 GBs.

Let’s say they also allow 2 GBs in the Cloud.

Is the flash drive’s disk space 8 GBs, plus 2 GBs in the cloud?

Or is the flash drive’s disk space 6 GBs, plus 2 GBs in the cloud?

It’s 8GB + 2 GB = 10GB