My company needs to start retaining all backed up data. We were using Carbonite, but I don't like the way they are set up for administrator access to data. Basically, HR is requesting that even overwritten files are kept backed up. Like I said, I've been using Carbonite for 2 years now, but they delete previous versions after so many. Any suggestions for software that would work with Amazon EC2 or E3 or other cloud services? I don't have much experience in this.