A:AnswerShort answer: it depends on the details of the player. Long answer: as external USB drives go, this is one of the best you can buy, and it's very reliable. However, the ability of devices to use external disks varies widely for mainly two reasons. Some devices have limitations to the amount of power they can deliver via USB, which is why some high-capacity USB disks have additional external power connectors. This one does not, since overall it is not very power hungry, but may still be asking too much for some USB connectors. Some devices also have limitations on the size of the external drive they can support. I have used this one successfully on SONY Blu-Ray players, and also on a Samsung smart TV and it works. But in the case of doubt, just try.
A:AnswerYes, you can back up music on it, no problem. They are just files. And whether 2TB is big enough depends on how much you are backing up. I'm using it to backup my laptop with a 256GB hard drive, so plenty big enough for my needs.
A:AnswerI've mostly used it in conjunction with my laptop, which has usb3.0. The writing rate has been variable at times, but has been about 60-80Mbps. For usb2.0, that'll translate to about 1/10th that speed.
A:AnswerDVR's typically use internal HDD's to record and playback video. External HDD's such as this one can be used to transfer content from the DVR to the HDD for storage.
A:AnswerYes, when you prepare the drive using your Mac's Drive Utility, you can set it up to be the Time Capsule drive... you just will have to leave it attached to the machine.
