So, now basically I have to create all those folder on this new file system, and then copy-paste all my content to the new folder? That's the right way?
Yes. But BEFORE moving anything remember to configure each Filesystem with the attributes you want.
For example, if you only have videos and photos in a Filsystem, it doesn't make much sense for it to be compressed. A Filsystem with documents you will want to compress it.
Posix permissions for everyone.