Software to inventory vinyl collection

If you make your own spreadsheet in Excel, you can sort various ways, add columns, ....

I would want to do that in someone else's software.

Discogs: can you download/backup the library?

On a PC you can export your collection. 

I like the discogs idea. It really depends on how long and what you want to do with your list. 

Collectorz 

http://Collectorz.com

I use Excel. 
 

Easy to use. Likely to be readily available in twenty years. You don’t want to get caught in something that goes away.