I have been running a small instance of NextCloud for personal data organization and backup purposes. For friends and family, I happily offer them an account to get them off of OneDrive, Dropbox, Etc. I am from the US, and run my server in the US. I have friends and family in Europe, and have offered them accounts as well.
I didn’t think about it at first, but I recently considered whether or not GDPR applies in this case. I’ve been having a hard time finding a definitive answer by researching online. If anyone here has any idea, I’d appreciate any input!