Jabref backup files

The .bib file and the .bak file can be moved around, but the directory to the file links have to be defined accordingly. In the menu File -> Database properties, set the General file directory using a relative path, such as ./MyFiles (or .\MyFiles depending of your operating system). Afterward, you should be able to move your database and your files around.

More details here: https://help.jabref.org/en/DatabaseProperties from comment https://discourse.jabref.org/t/linked-files-cant-be-opened-after-moving-the-bak-file/211