Hello, got about 10 old hard drives (Windows and Mac) which I need to consolidate. Is there any high capacity drive that can back up files of both OS? Is it better to buy one specifically for Mac and one specifically for Windows? Shall I buy a normal HD or a NAS? In the case of normal HD, anybody has experience with Seagate Backup Plus Portable Drives 4TB, Expansion Portable HD 4TB and Backup Plus Fast Portable Drive 4TB? In the case of NAS, which one do you recommend? I remember that four years ago, many people recommended products from Synology. Thanks.