user presets are only stored locally, so yes, you need to back them up before switching computer and then transfer them to the new one. All user preset menus have a ‘Manage in Finder /Explorer’ entry to quickly find their location.
I am not sure I understand you correctly but if you “only” wish to keep a multi-out routing you have saved in a Project/Preset when switching to another Preset, having the “Keep Output Routing on Preset Change” option checked would help you. This can be found in the Drums and Mixer Presets drop-down to the right of the Library drop-down.
Note however that libraries have different microphone setups, routings may have to be adjusted.
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