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Don't use software RAID. If you need resiliency on the system partition, use hardware RAID1. If you want resiliency for data, storage spaces is a better option in windows 10.<br />
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The answers to.your questions<br />
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1) windows will write an event log in most situations when a drove failure occurs. There are 3rd party apps (or SaaS cloud solutions) that can monitor your event logs and email you if you don't want to check event logs regularly yourself.<br />
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2) more drives is almost always better. Not really because chance of failure (that's what RAID addresses) but for performance. More drives means more reads and writes can happen simultaneously. Use as many droves as you can justify/afford while considering the possible need to add drives in the chassis in the future should growth exceed expectations.
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This is for a local backup I have the online but this is will be the on site local copy.<br />
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The customer isn't willing to pay for hardware raid , when dealing with storage I will go only with Raid 5. <br />
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Because it's only for a local copy of the backup I don't that worried about it. just need to check that everything is working well.
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Oh also the backup solution company won't allow NAS, they need a desktop or server .<br />
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So I'm limited, and I need to do in the cheapest way. Obviously, hardware Raid is much better. I know. <br />
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and if it's a little bit less then 4tb available that's fine.
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Now I'm also facing an issue to find a desktop that will allow so many hard drives.
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Lee W, MVP, You're right , but in this case it's not a server that run the business it a desktop/server the will hold only the local backups , it's part of a hybrid solution. the backups exists also on the cloud. it's just that if something happens the restore will be faster. that's it. <br />
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So in this case , having a software based desktop/server is ok. no one will access this machine . only in a case of disaster recovery
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andyalder: <br />
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I don't if you read my previous posts. <br />
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There will be 1 boot hard drive. and then 3-5 hard drives for the raid. So the raid won't have the boot system.<br />
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The raid will save the backup files from a different server. Just to hold those files.
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On windows 10 raid. <br />
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1. if one of the hard drives fails, how can I get a notice? can I create an alert / email or something like that?<br />
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2. I need 8tb , which is preferable 3x 4tb or 5x 2tb (raid 5) cause I know that the bigger hard drive the chances of it crashing is higher.
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On windows 10 raid. 

1. if one of the hard drives fails, how can I get a notice? can I create an alert / email or something like that?

2. I need 8tb , which is preferable 3x 4tb or 5x 2tb (raid 5) cause I know that the bigger hard drive the chances of it crashing is higher.

Windows -software based Raid

Windows 10 is a personal computer operating system featuring the "universal application architecture" (UAP); apps can be designed to run across multiple devices with nearly identical code, including PCs, tablets, smartphones, embedded systems, Xbox One, Surface Hub and HoloLens. Windows 10 also includes a virtual desktop system, a window and desktop management feature called Task View, the Microsoft Edge web browser, support for fingerprint and face recognition login, voice-based search (Cortana), new security features for enterprise environments, and DirectX 12 and WDDM 2.0 to improve the operating system's graphics capabilities for games.

Windows 10

RAID stands for Redundant Array of Independent Disks.

RAID is data storage technology that allows multiple drives to be used together as a single virtual drive for reasons such as fault tolerance, reliability and performance. 

There are several different levels of RAID that determine how the data is stored and the level of redundancy achieved across the drives.

RAID

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.