Do I need Acronis and Windows Image Backup

Hi

I am running Acronis True Image WD Edition on 2 laptops (Lenovo and Compaq) and  HP Pavilion PC.

All are running Windows 7 Home Edition. I made the Recovery and Repair Discs for them all when they were new.

I had also made Windows Image Backup. So all the backups are all on my WD My Book 320GB and I am running out of space. What I would like to know do I need both programs, Acronis and Windows or is just using Acronis sufficient.

Sorry if this seems a rather basic question.

Thanks

Cypriana

So you made two backups one using Acronis and the other using Windows Backup?