A content management system can maintain the entirety of a user account's content library. As a default behavior, updates made to the content library when accessed from any client device authorized by the user account, including adding, modifying, and/or deleting content items, can be synchronized across all other authorized client devices. A user can opt out of the default behavior and specify, for each authorized client device, certain portions of the content library that the content management system should or should not synchronize.