Largest  internal HD for a Mac Pro to run Time Machine

I have a Mac Pro with all 4 HD bays in use (each with a (750GB HD). The 4th HD, I made into the Time Machine HD. I recently looked at how much of the drive I have used and I am already at 608GB out of 698.32 capacity. I am running out of HD real estate quickly.
Question 1: What is the largest HD that will be accommodated by a Mac Pro? According to Apple the Mac Pro can accommodate up to 3 TB... I have already 3 TB ( 4 x 750GB)
Question 2: If there is a larger HD, can I swap out one of my other drives then copy the Time Machine info that I have in the 4th HD? then remove the Time Machine HD, and replace it with the new HD with all of the info previously on the Tine Machine and continue to use without missing a beat?
Thanks,
KJP
PS Why does it say 750 GB but it's actual capacity is only 698.32? Thats 50 plus GB s loss, I read that a 1 TB is actually ~908GB (a lost of 92 GBs). Why is this?

I think you should look into external drives and maybe RAID 0.
The other thought is to put your docs etc. on your boot drive, and RAID the remaining two drives.
Rick

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    A web operator who tells you that you have a “virus,” or that anything else is wrong with your computer, or that you have won a prize in a contest you never entered, is trying to commit a crime with you as the victim. (Some reputable websites did legitimately warn visitors who were infected with the "DNSChanger" malware. That exception to this rule no longer applies.)
    Pirated copies or "cracks" of commercial software, no matter where they come from, are unsafe.
    Software of any kind downloaded from a BitTorrent or from a Usenet binary newsgroup is unsafe.
    Software with a corporate brand, such as Adobe Flash Player, must be downloaded directly from the developer’s website. If it comes from any other source, it's unsafe.
    5. Java on the Web (not to be confused with JavaScript, to which it's not related, despite the similarity of the names) is a weak point in the security of any system. Java is, among other things, a platform for running complex applications in a web page, on the client. That was never a good idea, and Java's developers have had a lot of trouble implementing it without also creating a portal for malware to enter. Past Java exploits are the closest thing there has ever been to a Windows-style "virus" affecting OS X. Merely loading a page with malicious Java content could be harmful. Fortunately, Java on the Web is mostly extinct. Only a few outmoded sites still use it. Try to hasten the process of extinction by avoiding those sites, if you have a choice.
    Java is not included in OS X 10.7 and later. Discrete Java installers are distributed by Apple and by Oracle (the developer of Java.) Don't use either one unless you need it. Most people don't. If Java is installed, disable it — not JavaScript — in your browsers. In Safari, this is done by unchecking the box marked Enable Java in the Security tab of the preferences dialog.
    Regardless of version, experience has shown that Java on the Web can't be trusted. If you must use a Java applet for a specific task, enable Java only when needed for the task and disable it immediately when done. Close all other browser windows and tabs, and don't visit any other sites while Java is active. Never enable Java on a public web page that carries third-party advertising. Use it only on well-known, password-protected, secure websites without ads. In Safari 6 or later, you'll see a lock icon in the address bar with the abbreviation "https" when visiting a secure site.
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    Why shouldn't you use commercial "anti-virus" products?
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    In order to meet that nonexistent threat, the software modifies or duplicates low-level functions of the operating system, which is a waste of resources and a common cause of instability, bugs, and poor performance.
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    A Windows malware attachment in email is usually easy to recognize. The file name will often be targeted at people who aren't very bright; for example:
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