pi zero / diet pi / pi-hole / backup / smb

Hello guys,

I installed diet pi on a Pi zero and added pi-hole. Works great. I had planned to:

-backup the whole system (done)
-move the backup to a NAS (?)

I added smb and i can access a default share (on a windows pc for instance) but how do i mount/share the folder that has the backup in it?

ps: my NAS is a Qnap. Perhaps i will connect a usb-drive/HD to the Pi zero (but only if really necessary)
ps: i know how to ssh (did a headless install)

PS: (just thought of this) perhaps i should move the backup-location to the default-share?

managed to tar my backup to ftp.