Can I set up two-factor authentication on multiple devices? (CrashPlan for Small Business FAQ)
Yes. To set up your two-factor authentication on multiple devices, scan the QR code or manually enter the QR code presented during the setup on all the devices you want to use for authentication.
Multiple devices should not be used to allow multiple users to log into a single account. If multiple users need access to the CrashPlan console, you can add additional administrator users after signing in.