I use an EHD and Backblaze. I run the EHD backup as often as I remember and feel I need to, so anywhere from weekly to monthly. I had a HD crash in the spring and had to restore several weeks worth of data from Backblaze (the rest from my EHD), and I had no trouble downloading the files. In fact, there were things I was able to restore from Backblaze that should have been backed up on my EHD but weren't, primarily folders that included ~ in the name. But it sounds like Crashplan might be better for you if you want your EHD backed up.
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