I have much pc's and other smart divice and i need good backup place for all of theme. I have backup windows pc on google drive, some application's from iPad too on google drive, some on icloud drive. Also I don’t like cloud for privacy reasons. My two Mac's don't have backup. From one Mac maybe I will do my own NAS, but i will buy NAS from Synology - 4+ disk's slot (3 - backup, 1 music disk, 4 - backup, 1 music) because I need stream music to my reciver and Synology have app, where music on NAS is synchonicition into apple music app - I have iPod touch for playing music at home. I need build one place where I will have storage for all but where I can separatelly save data from every one divice. I think also about buy Mac Pro 2019 because it is only one upgradeable mac with pcie slots for extension with external disk’s in Apple lineup. It is very hard for decition. :D