I have a system with a single (/+/home) partition, with 275Gb and 18Gb free.
As per du, my /home takes 221Gb, so / would be about 36Gb.
I want to split it into / and /home partitions.
Besides the fact that would first free some, say, 40Gb, to lessen the burden, is there any way to partition other than copying all /home somewhere else where I have those ~200Gb available?
The "classical" recipe (e.g., 1, 2, 3) uses that, and implies ending with / with 275Gb and /home with ~200Gb.
Of course, I could then remove home_old, reduce the size of /, create a new partition in the freed space, and copy /home back in the new partition (which would also free the auxiliary ~200Gb).
That is my current plan, but I have to get those extra 200Gb, currently not available. I mean to avoid that, if possible at all.