We are digital librarians. Among us are represented the various reasons to keep data -- legal requirements, competitive requirements, uncertainty of permanence of cloud services, distaste for transmitting your data externally (e.g. government or corporate espionage), cultural and familial archivists, internet collapse preppers, and people who do it themselves so they're sure it's done right. Everyone has their reasons for curating the data they have decided to keep (either forever or For A Damn Long Time (tm) ). Along the way we have sought out like-minded individuals to exchange strategies, war stories, and cautionary tales of failures.
Power wise you should be fine. But daisy chaining USB is never good practice. You're adding more potential for packet errors and slowdowns. Do it right and get a powered hub with the number of ports you need.
In addition, if you're using more than one device at a time, you're limited to the bandwidth and resources of the port on your PC you're connected to. And the sum of multiple devices is usually less than the sum of the individual bandwidth possible on each device.