Help !

I can see the appeal of devices like the Vault, but if you rip all your CD's to one and then dispose of the physical media, you need to make sure you back it up, otherwise if the Vault goes bad or its hard drive dies, all of your music is gone.  From what I've read, it is possible to backup to an external hard drive, however it appears the music is stored in a proprietary format:

"The ext4 storage format is the same format that the Vault uses to store your data. It will not appear on most conventional Mac and Windows PC's."

You can also use the Vault as a NAS (Network Attached Storage) device and have your files show up on your computer -  https://support1.bluesound.com/hc/en-us/articles/200387457-Backing-Up-Your-Vault

Ideally, you should have two backups of all your important files - one on-site, and one off-site in case something happens to your home and both backup copies are lost (fire, flood, theft, etc.).

I haven't ripped all of my CD's, but I've been slowly copying them all to my computer.  I use foobar2000 to rip them, it has good tools for checking accuracy and a couple of lookup databases to automagically name the files.  I copy the files to an external hard drive that is automatically backed up daily by SyncBack and I also send a copy to the cloud with my online backup.

@onhwy61 What is this "legal issue" you mentioned?  I think you may have gotten some bad information.  

@almarg He said "dispose of", which to me means throwing away. 

If you make a copy of a CD and give that copy away, it is most certainly copyright infringement. 

I'm not an attorney, nor do I play one on the internet.  I'm not sure what the law says about donating the original to a library for example, however they are sure to be up to snuff on what they can and cannot accept. 

Here's a good resource for general information regarding copyright as it pertains to recorded music (as well as other copyrighted material - photos, books, etc.):   https://www.riaa.com/resources-learning/about-piracy/