I have a Ugreen DXP4800 Plus with four 10TB WD Red Plus drives set up in a raid 5 configuration. I'm a newbie to all this NAS business, but want to upgrade my drives to the biggest possible drives. I just ordered two 28tb seagate exos (ST28000NM000C) drives off serverpartdeals.com. From reading around on reddit, it seems like these drives are still pretty new and are HAMR drives so people are unsure of their quality and longevity. I guess my main question is if I replace two of my 10tb drives with these and rebuild my raid, if there are any failures with either of the two new drives can I put the either of the original two 10tb drives back in with no data loss? If everything goes well I plan to get two more 28TB drives and take the four 10TB drives plus a few more drives and build another NAS for off-site backup in a raid 6 configuration.