Advice on Keeping Directories Synced Between Two Linux Laptops?

I need advice about syncing directories between two Linux laptops. Currently, I'm using Google Drive mounted with google-drive-ocamlfuse on both machines, but it's causing significant performance issues. Basic operations like cp, mv, and even compilation are running very slowly. What I'm specifically looking for is a setup where each laptop maintains its own local copy of the data, with a master copy on a cloud/NFS server. The ideal tool would automatically sync changes made on either laptop with the master copy and update accordingly. Any suggestions for a better solution would be appreciated