Yesterday, my net storagecomputer system was attacked by a blackmail software. Yesterday, my computer system was attacked by a blackmail software.

In English, we generally do not use "blackmail" software. Instead, we use malware, or virus, or something like that.

I have six terabytes of movies and TV shows in the system and I am mad at it.angry about this attack. I have six terabytes of movies and TV shows in the system and I am angry about this attack.

Try not to use "mad" to describe your emotion. Instead, use angry. In English, mad could also denote "crazy".

However, before the blackmailmalware?? had the chance to encrypted the movies and the TV shows, I quickly turned off the equipment quickly. However, before the malware?? had the chance to encrypt the movies and the TV shows, I quickly turned off the equipment.