I have been using external HDDs as my main back up strategy for my home pc with music/movies/family pics etc. The current main data buildup is secondary to my photography hobby. I have added carbonite for cloud based back up for these files as well. I am hoping never to have to resort to retrieving data from them. Does monthly copy paste add errors over time especially going form one HD to another as my storage needs increase. Am I better off using backup software? I did try some avenues: My copy of Acronis did not work very well on my windows 7. The inbuilt windows 7 backup keeps eating space on the HD and fills them up fast over time. A free backup solution that was recommended here last year - had a very tedious interface and I ended up not using it (cant remember the name). So continue what I am doing or use a different backup modality. Please advise.