If it's not exposed to the internet no problem. Not true unfortunately under the GDPR nor it's predecessor, if the notes are publicly available:

Bodil Lindquist v Åklagarkammaren (2003) Mrs. Lindquist (whose purposes were mostly charitable and religious) published on a private home page personal data about her colleagues, including telephone numbers and information about a coworker’s injured foot and medical leave. This case raised the question if a private home page accessible to only those who have the address is permitted under one of the exclusions (household activity). The European Court of Justice ruled that it is not.