All of the proprietary Omni files are kept in three places
in the cloud of GDrive
half on my DATA:D drive as a folder
Half on OS:C SSD, especially the larger files like Zenith III's map, the Pavomni collab and most of the Omni mod collection
as for other important files, I should really back up certain irreplacable savegames and stuff like that
The two drives in this smash top will become SATA->USB portable backups, upon which two complete copies of the entire Omni collection will be kept. As Omni is my beloved pearl it is the first priority to backup, as well as perhaps my sticky notes where my passwords and Spectrum info are kept