P: preset backup restore

I prefer to store presets with Catalog for a number of reasons, one important being a backup with catalog and images (I have a dedicated HD for just LR, catalog, previews, images).
I only work with one catalog so all presets are there (I wish my DCP camera profiles would as well). Export as Catalog then Import with Catalog (and one selected image which can be deleted) does a pretty good job of transferring a lot of useful data including keywords, collections etc.

I prefer to store presets with Catalog for a number of reasons, one important being a backup with catalog and images (I have a dedicated HD for just LR, catalog, previews, images).
I only work with one catalog so all presets are there (I wish my DCP camera profiles would as well). Export as Catalog then Import with Catalog (and one selected image which can be deleted) does a pretty good job of transferring a lot of useful data including keywords, collections etc.

Some people have difficulties not fulling understanding how their software products work. 

As for these presets; in ACR you can export all of them into a single .zip file by context clicking on the User Presets header in the GUI and picking "Export Presets Group...".  You can them import that .zip file on a different machine using the "Import Profiles and Presets..." command and picking that same .zip file which unzips and places the presets where they need to go. 

Henk von Pickartz: You might want to check out this article so for guidance. There are still some settings that don't get stored with the catalog:

https://www.lightroomqueen.com/store-presets-with-catalog/

You can set Lightroom to save presets to the catalog.  They're stored in an easily accessible folder within the catalog folder.  I've been doing this for years.  Makes it easy to back them up... move them to other catalogs etc.