Is Evernote safe enough to store personal data?
Yes, Evernote is safe to store personal data. The service is using AES 128bit encryption. All the operations inside your "account/vault" are encrypted. The data is decrypted only when you access it.
To find additional information related to data encryption, access the following website provided by the developers: https://evernote.com/contact/support/kb/#/article/23480996