Preferred Digital Music File Backup?

Data backup on Cloud can get damaged many ways.  It can be deleted/overwritten by user's mistake or malicious attack on his or Cloud computer (or major Cloud hardware/software failure).  To me internet storage is only acceptable as a second backup, that should be outside of the home anyway (fire, theft etc.).  I keep music on HD drive and two HD backups (one outside of home) - total of 3 drives because it is possible that, while updating backup, something (like virus, controller failure, my mistake etc.) will damage both drives.
I update only one backup (stagger them) at the time and only after 5-10 new CDs added.  It is very safe, since unpowered, disconnected drives in storage tend not to fail.

How much do you actually have in GB?

Good cloud storage includes versioning so human error is avoided and good ones are encrypted limiting hacks. Virtually all quality cloud storage has multi site redundancy.

atdavid, Are you saying it cannot happen?

https://medium.com/genaro-network/tencent-was-claimed-ten-million-for-data-loss-due-to-cloud-hard-drive-glitch-344a26449fe2

https://www.readitquik.com/articles/cloud-3/6-cloud-computing-failures-that-shocked-the-world/

Those top-6 never resulting in more than a few hours of data loss in one case. The Tencent was an anomaly.

Compare that to the horror stories many have w.r.t. backup failures that they thought were "robust".  Real time mirroring of your data, secure multi-location storage with robust protocols, background operation requiring no additional work except making sure the connection is live is going to be on average much safer.