Now I know why some users got offended. Please can we stop wittering about subjects some of us clearly do not understand?
Since it seems to be important to some, I'm a moderator on this forum having been a user for 15 or so years with 60,000+ notes and 400+ notebooks.
You can't have more than 1,000 notebooks, it's a system limit.
You should not export more than one notebook at a time because the format does not capture notebook metadata. If you export multiple notebooks, you'll re-import to one notebook only. It tends to lead to tears.
If you go to the Notebooks page you have an option to export one notebook at a time. If you wish to do more there are several ways to do it.
As to Notejoy this page is rapdily becoming the forum that their site apparently lacks. It seems a tad rude to hijack Evernote's forums in that way. We're here for technical suggestions about Evernote features and a bit of ranting and gossip, with the fundamental rule "please behave like a grown up."
As a moderator I do have the power to zap any posts that cross that line.
Please consider your next post carefully....
From the Notebooks page: