Working across different Vauls

Dear Obsidian Team, for data protection reasons it is often not possible to completely synchronize all data of a vault with the cloud. Therefore, it would be very helpful to either exclude folders or individual files from synchronization within a vault or, alternatively, to work with two different vaults, one of which is synchronized and the other not. But then it should be possible to use the functions of Obsidian across different vaults. Since this last solution seems to me to be the easiest to realize, I would like to ask you to implement the functions that enable cross-vault work in Obsidian in the future. Thanks for the effort