Make sure that you are saving backups of your listings.
Settings > options > download data
There is no automated upload available, but it does give you a copy of all the text that you have entered, and provides links to the master images saved on Etsy. You can use it for repairing damaged listings, and for recreating deleted listings.
Lawrence (Clare's other half)
I appreciate the tip and will add that to my process in the future.
I want to alert other sellers that this may have happened to their own listings. I also want Etsy to explain how deleting item data that is accurate and valid is an acceptable business strategy.
Yes, we're finding this as well. It's unacceptable that Etsy makes these changes without our knowledge &/or consent. By removing attributes in existing sellers' listings, they are violating our privacy in a sense. And as with every wrongheaded test/change/screwup by Etsy, we foot the bill with endless uncompensated time/labor trying to fix this nonsense.
Glad I'm not the only one, how infuriating - Etsy removed three of my material attributes per listing and replaced them with just one attribute 'paper', which NONE of my materials are made of paper! This is incorrect information for the buyers.
Now, I can't manually add it as before and it is not in the dropdown list.
Looks like I will have no attributes at all.
Please fix this, Etsy.