Real time operating system - Intended to serve real time applications that process data as it comes in. 

Single user operating system - Used as a maintenance

Bootstrapping - the program that boots the OS.

Device drivers - This controls a particular type of device that is attached to your computer. 

OS Memory manager - The process of controlling and coordinating computer memory, assigning portions called blocks to various running programs to optimise overall system performance. 

Blocksize - A physical record of bytes and bits. 

Kernel - The central or core part of the OS used to control and manage system component tasks. 

Interrupts - Something that needs immediate attention. 

Disk access - Accessing backup storage

File systems - To control how data is organised on a backing storage

Menu based - Menu choices that a user can select to navigate from one place to another.

Striping - 2 hard disks, half to each faster.

Mirroring - Copying data from one location to a storage device in real time. 

Bit rate - This describes the rate at which bits are transferred from one location to another. Basically , it measures how much data is transmitted in a given amount of time.

Baud - The number of times, a signal changes per second.

Menu based interface - A computer interface so designed that instructions from the user to the system are chosen from a displayed list of options rather than input by the user as a series of memorised commands.  

Touchscreen - This is an input and output device normally layered on the top of an electronic visual display. 

There are two types of touch screens, Resistive and capacitive.

Resistive touch - Touch down on it and it flexes back where you've pressed the screen,This is glass coated. It is more accurate .

Capacitive touch - this consists of two spaced layers of glass, that is coated with a conductor. When the human finger touches the glass of the capacitive surface, it changes the local electrostatic.

HDD - Hard disk drive 

SSD  - Solid state drive

HTML - Hypertext markup language

OS - Operating system

HW - Hardware

UI - User interface (So the user can interact with the computer/device)

IP - Internet protocol. This is the method or protocol by which data is sent from one computer to another on the internet. 

DHCP - Dynamic/data host configuration protocol

DNS - Domain name system

HTTP - Hypertext transfer protocol. This is used by the World Wide Web and this protocol defines how messages are formatted and transmitted, and what actions Web servers and browsers should take in response to various commands.

TCP  - Transmission control protocol. This is a set of networking protocols that allows two or more computers to communicate.

UDP - User diagram protocol 

POP3 - Post office protocol 3 (Client/server in which emails are received)

SMTP - Simple mail transfer protocol (Protocol used to send emails over internet) 

GUI - Graphical user interface (This is a human computer interface e.g. a way for humans to interact with computers)

CLI - Command-line interface (Also known as command line user interface, console user interface and character user interface.)

WIMP - Windows, Icons, Menus, Pointer. 

RAM - Random access memory (Temporary volatile storage)

MB - Motherboard (Allows all components to communicate)

CS - Client server - Denoting a computer system in which a central server provides data to a number of networked workstations.
RAID - Redundant Array of Independent Disks
NAS - Network area storage
LAN - Local area network
MAN - Metropolititan area network
WAN - Wide area network
PAN - Personal area network
SAN - 
IEEE 802.11-  This is a set of media access control

To back something up means that you copy it or make a copy of it so that if your work/documents gets lots then you have a spare copy that you have backed up. You do this by putting it in another area such as on a USB drive or any other eternal storage.

Why do we do this?

We do this so that we have a spare copy of whatever it is that you don't want to be lost, so that is there is a virus or it is accidentally deleted then you still have all your work.

What are the types of backup we can do?

The different types of backups are things such as differential backup, incremental backup and full back-up. 

Who should be doing it? 

If it is your files then it will be you backing them up, who ever is in charge of it will back it up. 

How?

You can back them up by things such as thumb drives, external backup drives and cloud backup.

Differential backup - This is a type of backup that copies all of your data that changed since the last backup. For example if a full backup is done on Sunday, Monday’s differential backup backs up all the files changed or added since Sunday’s full backup.

Incremental - This is a type of backup that only copies files that have changed since the previous backup. For example if a full backup was performed on Monday, Tuesdays incremental will backup all changed files since Mondays backup. However Wednesday's incremental will only backup files that have changed since Tuesdays incremental backup and so on until another full backup is performed.

Full backup - This stores all the files and folders, this is a complete backup of everything you want to backup.