rsync prevent destination only new folders but need new files

[charith]

Good day to all!

I'm doing git file replication task and need to sync source destination,
using below sync command.

rsync -atnvv --existing --exclude '.git' --progress source/ destination/;

Here I,

1) need  only sync directories that *exist on destination* ,no new folders
should copy from source - [used  --existing did the job but it not copying
new files also.]

2) need to copy *new files *on source  directory to destination.

Thanks in advance
Charith.
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