yes
yes
This is not a backup drive, its a USB hub. Its designed to add more USB ports when you do not have enough for all of your devices.
All major operating systems support USB devices.
backward compatible
You cannot use a USB storage media for sending storage on an iPad. You need a computer with iTunes. You could make a backup using iTunes and store that backup on a USB drive, but you still need iTunes to restore it to the iPad.
USB 2.0 supports a maximum signaling rate of 480 Mbit/s
Usb devices
Yes. If you do not have a version of Windows 95 that supports USB directly, you can still use a USB keyoboard by enabling "Legacy USB support" in your computer's BIOS.
Both an iOS or Android device supports a USB port, but only Android devices have a slot for a microSD card.
Computer backup means backing up data from the computer to a USB/external HD/CD/DVD etc. Computer Backup in process will mean a backup is taking place and is in process for backing up data.
Universal storage device (USB) and hard disk drive
It allows to use USB hot-swappable devices, the data transfer is not that bad, and supports huge number of devices.