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Found that also myself trying to do the same thing haha.
I did the same process as OP, gparted took 2.5 hours in my 1TB HDD to create a new partition, then copying the data from old to new partition was painfully slow, so I went to copy it to another dive and into the new partition.
Afterwards I deleted the old partition and grew the new one, which took a bit more than 1.5 hours.
If I had the space I would have copied all the data out of the drive, formatted it and then copied back into. It would have been quicker.
I also like local only with a similar set up as yours, rsync to and HDD and to an SSD.
But I also would recommend you to follow that suggestion, you need to have an external backup managed by someone else (encrypted, of course) so you can have options if anything happens to everything in your local.
It’s up to you how much you’re willing to pay to be sure to be able to retrieve your data.
I’m using iDrive e2, it says it has a limited offer, but it’s been there for over a year.
Im basically paying $1.25 for 2TB per month (it’s charged at once for 24 months) https://www.idrive.com/s3-storage-e2/pricing