WD My Passport Ultra 2TB USB 3.0 Portable Drive with Auto and Cloud Backup - Titanium

Title : WD My Passport Ultra 2TB USB 3.0 Portable Drive with Auto and Cloud Backup - Titanium
ASIN : B00CSH1B4M

Features :

• Width:82 mm
• Height:110.5 mm
• Depth:20.9 mm
• Capacity:2 TB
• Weight:230 g

List Price : £139.00
Price : £123.38
Saved Price : £15.62

category: Products
brand: Western Digital
Item Page Detail URL : link
Rating : 4.1
Review : Manual
I have backed up one of my PCs but could not fully back up a second PC. It keeps saying some backup has failed due to communication error!!! Also as per the instructions in the Manual , I should have been prompted for an Activation Code (apparently you can only use it for two additional PCs) for the second PC but it did not. I hope to resolve it by following the instructions again. The setup is not straight forward. I bought this purely beacuse of the pedigree of WD drives- hope it is not a mistake and may be I should have gone with Buffalo Drives!!!