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Can anyone give a real beginners guide into what types of scenario (e.g. physical disaster, user error, hardware failure) the various replication/DR features at both HW and SW level actually save you from? <br />
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For arguments sake, say your setup consists of 5 ESXi hosts in a HA cluster - 2 SAN's at different physical offices which do a HW level replication between each, and you also have a backup software that also does some form of replication? <br />
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What kind of failure/issue do the 3 levels actually save you from, I need to get it clear why you need all 3 and what different types of disaster each saves you from, esxi HA cluster of hosts, SAN-to-SAN replication, and replication feature at SW level as part of your backup solution.
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Can anyone give a real beginners guide into what types of scenario (e.g. physical disaster, user error, hardware failure) the various replication/DR features at both HW and SW level actually save you from? 

For arguments sake, say your setup consists of 5 ESXi hosts in a HA cluster - 2 SAN's at different physical offices which do a HW level replication between each, and you also have a backup software that also does some form of replication? 

What kind of failure/issue do the 3 levels actually save you from, I need to get it clear why you need all 3 and what different types of disaster each saves you from, esxi HA cluster of hosts, SAN-to-SAN replication, and replication feature at SW level as part of your backup solution.

various types of replication and HA - disaster scenarios

Computer data storage, often called storage or memory, is a technology consisting of computer components and recording media used to retain digital data. In addition to local storage devices like CD and DVD readers, hard drives and flash drives, solid state drives can hold enormous amounts of data in a very small device. Cloud services and other new forms of remote storage also add to the capacity of devices and their ability to access more data without building additional data storage into a device.

Storage

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Virtualization

VMware, a software company founded in 1998,  was one of the first commercially successful companies to offer x86 virtualization. The storage company EMC purchased VMware in 1994. Dell Technologies acquired EMC in 2016. VMware’s parent company is now Dell Technologies.

VMware has many software products that run on desktops, Microsoft Windows, Linux, and macOS, which allows the virtualizing of the x86 architecture.  Its enterprise software hypervisor for servers, VMware vSphere Hypervisor (ESXi), is a bare-metal hypervisor that runs directly on the server hardware and does not require an additional underlying operating system.

VMware

Hardware includes cell phones and other digital living devices, tablets, computers, servers, peripherals and components, printers and scanners, gaming consoles, networking hardware such as routers, hubs, switches and modems, storage devices and security equipment such as firewalls and other appliances.