Simple, export the same collection to 2 different drives.
Or setup mirror images or ISO’s or 3rd party software backup images of said drive…
Personally my current backup solution is:
I have my full collection on 2 USB drives, 1 as live, 1 as backup. Then a further MicroSD card to act as a second backup.
After making changes to my collection and exporting to 1 of the drives, I use comparison software (Beyond Compare) to copy over only the changed files only to the other drives - that way I avoid waiting hours for exports.
My master DJ collection which is stored on my laptop is mirrored to NAS storage.
How does one usually create a backup of a DJ USB? I really didn’t think I needed to spell this out, after all, a simple Google search will offer many of the same, if not better solutions…
As a DJ your greatest asset is your collection, so you absolutely need to have at the very least 1 backup, preferably more… Data corruption can happen far too easily to take chances.