What is the best way to switch hard drives and not mess up the project?

My recommendation is for a Mac setup:
I primarily use Carbon Copy Cloner for cloning drives and backing up drives.
An alternative is Super Duper

In order for it not to lose the links between the projects you need to name the new drive with the same exact name. I'm about 99% sure this is correct.

I would recommend 2 x 3tb drives over the 6TB raid 0 drive. The raid 0 gives you no redundancy. You should buy 2 new drives so one can be the backup for the next time the drive goes out (and they will). I've also started using Crashplan as my third backup. Bought 4 year unlimited backup for $139.99 at the time, looks like it is $189 now for 4 years. I was fed up with losing things. Have a stack of hard drives to prove it. It will take a long time for crash plan to upload that many gigs (months). But now that it's up it does versioning on files and i can always go back to an old version if I have file corruption or a glitch.
 
OP: conceptually, treat your old drive(s) as a backup drive and try to restore your projects to your new drive. Operationally, 1) first copy everything on your old drive to your new drive and keep the same file folder structure, and 2) then mount the new drive in the place of your old one the same way you did the old one. Your project folders will retain the same paths and everything on your new drive should work the old way.


OT: Re: Crashplan.

It could be a good service if and only if your total amount of data to protect is limited, otherwise there could be a very hefty hidden cost on the user's side. Here is why. In US (as well as I guess in many other countries), an affordable Internet plan for home users or small business users comes with a very limited bandwidth for data uploading, no matter how fast the download speed is offered at. And that is understandable, as otherwise every home computer could easily be turned into a powerful fast server for cheap.

In US, my upload speed was used to be capped at only 256Kbps, despite my download speed was at least 1.5mbps more than 10 years ago. Given that upload speed, and given that I now have about 4TB (4,000GB, or 4,000,000MB, or 4,000,000,000KB) data files to protect, how long would it take for me to upload all my data to the Crashplan server for protection?

256Kbps = 32KB max / second
x 60 seconds / minute
x 60 minutes / hour
x 24 hours / day
x 30 days / month
x 48 months
= 3,981,312,000 KB
= almost yet less than 4TB

You see, I'd need over 48 months of days and nights of continuous uploading in order to backup all my data to Crashplan. If that's too long, the Internet plan would have to be upgraded, which means more money.

In case I lost all my data in an accident (say, in a fire), I'd need to completely restore my data in my home computer. How long would it take for me to restore all my data from Crashplan? Let's say I have a very fast 25Mbps Internet plan. That's about 100x times the above upload speed. Given that speed, it'd take 48 / 100 = 0.48 months = nearly 2 weeks of nonstop download to completely restore all my data. For lots of home users or small businesses at the time, you can hardly go beyond 25Mbps without speeding way too much money.

Crashplan is only good for protecting a "small" amount of data. As to how small is small, that'll depend on how much money you want to spend in boosting your Internet upload speed.
 
Thanks for breaking down the speed for those that might not have the bandwidth. I'm getting 10-20mbps uploads so it works for me. I've got about 3TB backed up now. I'm editing a feature and have had so many hard drive failures in the past, that a third redundant copy is important to me. Plus it's incremental so if a file get's messed up I can go back and pull an older version.
 
You can also go through the media manager to consolidate and move the whole project from the two drives to the single. This will also make sure that your sequences stay linked to the media.
 
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