A:AnswerIt is compatible for a backup as advertised, not for extended storage on ps4 for gaming. Found this out the hard way, if you want a drive for extended storage its safest to buy a "gaming drive" to make sure you dont waste your money like i did.
A:AnswerI do not use a Mac, I have PC. But on the box it has System Requirements: Operating System - Windows 10 | Windows 8.1 | Windows 7 | MAC OS v10.8-10.12
I hope that helps you.
A:AnswerYes, this drive can be used for Time Machine. I would recommend formatting the drive first using Disk Utility to the APFS file system and suggest to purchase a drive that is at least twice the capacity of your Mac’s primary drive.
A:AnswerYes, I believe it is backwards compatible with USB 2.0 (I think it says so in the product info or tech specs). I think all USB 3.0 are backwards compatible to USB 2.0. It just won't be as fast.