How can I preserve a GB ROM? CD or hard disk?

Hello everybody, I'm a collector from Italy. Recently I could put my hands on a GB prototype cartridge and I wanted to preserve the data inside because I know that's common the phenomenon of the bitrot.
I bought a Retrode2 that's wonderful for extracting the ROMs from cartridges. I used it to extract the ROM from the prototype (and it worked) but I also wanted to preserve the extracted ROM in a physical support.
I don't know what's the best method to use. Is the CD rom the best one or should I use an hard disk?
I really appreciate the help because I do't know how to do for preserving it and I don't want it to be lost.
Thank you again

 

Personally, I would use a cd-rom, but thats just me. I am actually going to face the same scenario when my GB proto arrives. Definitely back it up in multiple ways; like a flash drive, cd, and on a computer

 

If you don't mind me asking what is the prototype?

 

Posting online is the guaranteed way to make sure it will never disappear. This especially applies to archive.org, who specializes in preservation.

 

If you are paranoid have it backed up on a magneto-optical disc and a backup tape (DDS or travan come to mind) have a local copy and a cloud storage option. Practically though your backup must cover all possible problems.
1: Physical failure loss or destruction of the backup media, multiple locations and formats is a must.
2: restorability of the backup, are you sure your hdd will work in 5 years? Maybe but is it encrypted? Wiped out by viruses? Tape drive not supported on windows 10.1?
3: integrity of the backup, the CD-R copy of a gdrom may play but are there more compression artifacts now?
The point is to make sure that any backup is restorable to a form functionally identical to the original when possible. And do not use cheap consumer grade junk. DVD-r is especially bad...

 

How to preserve prototype ROM?
1) Simple way - release it to the public, millions of users will have it, it will never disappear.

2) If first solution is imposible there are two ways - cheaper way and expensive way. Cheaper way - multiple copies on quality CD/DVD-R plus a few copies on reliable OLD HDD models, preferable those which known to work for years and made before RoHS and lead-free solder. Store them in different places, like different parts of the city/town/village.
Expensive way - LTO cartridge backup on 3-4 cartridges stored in different places. Those are very reliable but expensive, both drives and cartridges.

 

Thank you for all of your answers. How does the LTO cartridge works? In case of writing on high quality CDs, what are the ones you can suggest and what can be the best program to use in Win10 to write data on discs?