N00b: Only backup certain folders during full backup (linux client, server)

I’ve tried searching for what must be obvious to everyone else but failed.
On my ubuntu 20 plex server, the plex folder contains several million very small files and several thousand subfolders that change constantly. I don’t want to back up this entire parent folder during incremental backups because doing so takes hours and is unnecessary. I only want to back up this parent folder during full backups.
How do I achieve this?

Hi @SpinCharm,

you have to add excluded folders in the server web frontend for the particular client. Have you checked that option in “File Backups” tab?