When you back up a Fusion Drive, you'll back up its single volume rather than two separate disks. The Fusion Drive is two drives, but it looks like oneĪpple's Fusion Drive is designed to work invisibly, so you won't see two separate volumes in the Finder: if you go for the 1TB version you'll see a single volume with 1.12TB of storage (1TB of hard disk space coupled to 128GB of SSD storage) and if you go for the 3TB you'll get 3.12TB. However, the Fusion Drive is neither a caching drive or a RAID one: it's a hybrid drive, so instead of mirroring - creating a cached copy of frequently used data on the SSD - it moves frequently used data from the HDD to the SSD. We've seen hard disks with SSD caching for years now, and of course RAID (Redundant Array of Inexpensive Disks) storage has been around since PCs were made of wood. The Fusion Drive doesn't use caching and isn't a RAID drive The Fusion Drive comes with core apps on the SSD and documents on the hard disk, but Apple's Phil Schiller says that its software will monitor what you're using and move things from SSD to HDD and vice-versa.
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