That's a lot of data.
But I know what that's like. I whittled mine down to just under 180 GB of essential data on my new working laptop. My older laptop had about 930 GB.
One of the positives of only copying essential data onto the new laptop is that my other data, which are frequently accessed, are readily available on two backup drives. So for now at least, my new laptop is lean, and optimized.
Considering all of the work that I've done over the years, I'm a bit surprised that I only have about 1.3 TB of data that's copied, and backed up on various external drives. Then again, a lot of work was done with partners, so the media holding it is dependent on who has the rights.
To this day, I'm still amazed at how much data Google stores. The last I read on this claimed around 10-15 exabytes. But I think the NSA holds the most, or surely near the top. Imagine keeping all of that data backed up, although in practice I think it's basically a series of relatively small backups that occur simultaneously.
In any case, the relatively large amount of data that I have is one of the reasons I keep it backed up incrementally. Mostly. When it comes time to start over with a fresh, clean backup, that's when I feel the pain of how much time it takes.
Hang in there.