I get to go back and listen to songs I wrote and recorded fifteen years ago. If they had been on my computer systems for that long, some of them would have been lost due to computer failures.
Have you thought about CD ROMs, Thumb Drives or SD Cards?
If volume is an issue an external 20 TB SSD can store over 300,000 songs assuming 5-minute, CD-quality stereo songs.
Just store it in a fireproof/waterproof safe.
If you are really prolific buy two
