Discs are the best way to save your files! DVD or Bluray(25,50 or 128gb). Then there is no way to delete them! Cause hackers will delete the entire worlds hard drives one time in the future or just hd fail! Disk is the best way.
It`s impossible to delete discs.
This is what I do!
Export all tracks (no plugins)
Save cubase song with no plugins(2 versions)
include plugins used with serials on disc
BACKUP!