Evernote has an automatic note version backup running on the servers in the cloud
More information at How-to-use-note-history-to-view-older-versions-of-a-note
Evernote (Windows/Mac) has an export feature; it processes whatever notes are selected
- For a weekly full backup, I select all notes
- For daily incremental, I select changed notes (based on date updated)
There are two options; .enex and .html (I use html format)
My backups run on a Mac, automated by an Applescript to run each morning at 7am
More information at How-to-export-content-from-Evernote
A raw database backup saves the entire database folder/file
More information at How-to-back-up-and-restore-your-data-in-Evernote-for-Windows
My backups run on a Mac, automated by the Time Machine process to run each hour (incremental)