How to replicate to an external USB disk?

I’ve just set up a new truenas install and copied all my data to it, I understand I needed to create a new pool on the external USB which I have done then set up a replication task, which runs, but transfers no data, I understand I need to tick full file system backup which when I do, I get an error an it wont allow me to save the job.

Can anyone help, i’m tearing my hair out.

I just tried to embed screenshots showing my settings but I’m not allowed?

Figured it out after re-reading the error for the 20th time, I had to tick recursive under the snapshot task, not the replication task can close/delete now

It is good you found and fixed your problem. It is easy to misread so don’t feel bad.