April 19, 20215 yr I'm considering building a backup system for my current unRAID setup. I've seen systems with 3GBps hardware; I thought about buying them since I think I could save some money vs 6 or 12GBps systems. Transfer speed wouldn't matter all that much since the backups would be a differential (what I added from last backup). Yes; the initial backup would be slow... In short, why else would I not want to go with a system that is 3Gbps for the drives?
April 19, 20215 yr 3Gbps is fine for hard drives, just be aware that some 3Gbps hardware is limited to 2TiB max capacity, e.g., LSI SAS HBAs and SAS expanders.
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