I have about 15TB of data across several RAID6 arrays, and it's been growing at a rate of about 10%. I want a cheap solution to back up this data at regular intervals and bring offsite. So I purchased five 3TB drives, hoping to just back them up using a eSATA drive dock. Ideally, I wanted to load up 3TBs at a time, and keep popping in drives until I was done.
However, the filesystems I'm backing up have deep and complex folder structures, so that would rule out doing a folder by folder backup especially as I plan on doing this every few weeks. Incremental backups would be ideal, and I just keep adding drives as needed. However, I wasn't able to find an affordable solution to this (Roxio Retrospect is too pricey).
Does anybody have any suggestions?