iCloud stores your photos, videos, documents, music, apps and more, keeping them updated across all your Apple devices. However, it has its own limitations and downsides when compared with IDrive. The major benefit of using IDrive is that it is cross-platform compatible - you can backup and restore files across PCs, Macs, iPhones, iPads, Androids and Windows Phone devices.
Furthermore, IDrive uses 256-bit AES encryption, along with an optional private key for additional security - known only to you.