Hopefully not :) Zoolz is, I think, a British company but their data centres are apparently at about half a dozen international sites. Zoolz now seems to have separated it's home use from business use. https://home.zoolz.co.uk/ Still works! The business use under the name of Bigmind. Their slightly annoying site is here https://bigmind.zoolz.com/
I don't think they would go wiping all the drives with out letting people know
As with anything you care to mention, they or something they rely on may go out of business. Who can tell what may happen in even a few years time? If I was seriously into cloud backup, I'd use two unrelated sites anyway Try reading some reviews. They are not new to the market. I've traced Zoolz website back to 2012. If you get a few years out of them that's a TOTAL of £34 for 2 terabytes
The point stands. If they go out of business Amazon is not going to keep them running, are they?
It's been ok with me, but apparently according to someone who posted when I last mentioned this you have to be careful with copyrighted material for instance. It can get removed. So it should be encrypted. Even more negative votes this time. Haha.