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Where is my storage going..

Apr 27, 2016
Lightroom Experience
Lightroom Version
Lightroom Version
Lightroom Classic
Operating System
macOS 10.14 Mojave

Recently I completed a rather painful exercise of starting afresh with Lightroom by going straight into Lightroom CC and storing my entire library on a 1TB Adobe plan first hand. Now that process has completed (14days solid Virgin Media connection maxed out) I would like to work on Lightroom Classic allowing a new catalog to form by downloading the data from adobe and forming its own local storage structure it prefers. Once it's done that I'll back it up on one of my server systems.
So I've assigned the catalog to sit on a separate 10TB system but during the night of it downloading from Adobe it appears my 1TB SSD on the iMac has completely filled up. I'm struggling to find where all this has gone so my question is... What and where is Lightroom downloading data from and storing it on my local drive even after I've mapped the original files and catalog on a separate drive? My assumption is adobe must have their own kind of tempory cache file that's causing this issue.

Any thoughts?
Jul 2, 2015
Lightroom Experience
Power User
Lightroom Version
The download location for online images is specified in Preferences - Lightroom Sync. The default is an lrdata ‘package’ located in your catalog folder, but you can change this to any folder on any drive, and you can setup a dated folder hierarchy. The package will show as a ‘device’ (like a separate hard drive) in your folder panel, so you can move any images that were already downloaded by dragging and dropping these into that new location.