I'd appreciate it if you were able to assist me with any research or articles you may have regarding online backup, specifically with regards to bit basis vs. file basis.
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If you're talking about remote backup, then bit/byte level is the only way to go. (By that, I mean something that sends only the changed bytes/bits across the network -- not just changed files.) There's simply too much that changes on a daily basis to back up across a remote link without doing some type of bit-level or byte-level backup. Given the tone of your question, I'm not sure if that's the answer you're looking for. If you're talking locally, it's a trade-off. That is, bit-level adds a level of complexity that you need to consider when considering such solution. File-level is a lot easier to do if you've got all the bandwidth that you need. On the other hand, bit-level will reduce your storage costs. Like I said, it's a trade off. As to articles, I would look at some of my earlier Storage magazine articles about disk-based backups.
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