Backup external hard drive to the cloud via Time Capsule
Solution 1:
Yes - but the flow of the data isn't linked directly.
- The external drive can be opted in to back up to any Time Machine destination as long as there's enough space on the destination drive.
- You can configure CrashPlan to back up files from the external drive - directly to the cloud.
Note: These are independent - you could enable 1 and not 2 or 2 and not 1 or both 1 and 2 as you wish. Getting Crash Plan to see files from within the protected Time Machine storage isn't something I would recommend.