Help Understanding RAID

i need dummy's guide raid basics having problem translating real world situation

looking secure solution store ongoing , key projects in location not computer specific if machine goes down can hop on computer work available

have mac pro 4 bays
2tb time machine
1tb company work
1.5 tb company b work
500gb os , scratch disc



looking migrate files external raid not sure how work. how intergrate time machine process

getting confused between redundancy needed raid , effective up.

bought 8tb raid effective space 4tb other 4 tb redundancy of raid not space available backup ie time machine?

need 2 raids 1 work , 1 time machine?

can 1 suffering overload of information , no understanding.

 

this pretty place start:

http://www.bit-tech.net/hardware/2007/06/11/understanding_raid/

gives overview, , provides specific answers.

 

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