Are you sure about your Macbook Pro with a 1 TB SSD? I ask because until now Apple sells Macbooks with only 256/512 or 768GB SSD.
I see in your scenario some problems:
In order that Time Machine can keep backups over several weeks/month your Time machine disk should have the capacity of 2x, at least 1.5x of your Macbook hard disk.
When your notebook is full, your Time Machine disk will also be almost full and Time Machine will begin to delete the first backups you made, that means your are going to lose data.
Because you are very concerned about the security of the data on your LaCie disks, you are planning to have two of them for backup. But what are you going to do when your Macbook drive fails? Are you prepared?
OK, what would I do in your situation?
I would store all my new events and projects on my Macbook and everyday I would run Time Machine (on the first LaCie) in order to backup those data.
All finished projects (including events) I would move to an external drive (second LaCie) in order to make space. At the end of the day I would backup this external drive to another external drive (third LaCie). And I would buy another 512GB SSD for the case that my Macbook SSD fails.
Letâ€™s check this scenario:
When your Macbook SSD fails, you have a copy on the Time Machine. You can install the SSD in reserve and re-install everything from the Time Machine copy.
When your Time Machine drive fails, you have still the original data on the Macbook.
When one of your external drives fails, you still have a copy on the other external drive.
It seems, in this scenario your data are pretty safe. What do you need? 3 x LaCie and a reserve SSD for your Macbook.
BTW, Time Machine does not compress the data.