Using NextCloud Windows Application for Sync, But looking for a feature

We are using NextCloud Windows Application for Sync. One of my client is looking for a feature, where the data/files are pushed in to cloud server and not deleted when deleting it locally.

i.e new/modified files to be uploaded or sync happens, when customer deletes the file locally the same file should not be deleted in the cloud server.

How to enable this feature? Kindly help me.