Get one of the newer manuals, which were written, when the new TotalMix FX was already out.
Explained e.g. here in ch 20.5.2
https://www.rme-audio.de/downloads/hdspeaiopro_d.pdf
https://www.rme-audio.de/downloads/hdspeaiopro_e.pdf
All settings (except those of preferences) are saved in the workspace file.
This is how I make a backup of my TotalMix FX settings, which includes snapshots.
Those files you should include into your Operating Systems backup.
I use additionally Quick workspace select.
These are 30 fix slots for different workspace setups (which include 8 snapshots).
So you have 30x8 Snapshots in quick access.
And even nicer, the first nine workspaces you can restore easily with the key combination ALT-1, .., ALT-9 (9x 8Snapshots=72). By this you have 9 different Window Settings with 8 Snapshots available at your fingertips.
BR Ramses - UFX III, 12Mic, XTC, ADI-2 Pro FS R BE, RayDAT, X10SRi-F, E5-1680v4, Win10Pro22H2, Cub14