Problem with rsync backup

I am trying to backup my computer to an external drive using rsync.
From / to /media/root-backup
The problem: rsync copies more directories than I want and it
copies /media/root-backup multiple times.

I have included my backup script and filter rule file.
Hoping someone will see the mistake.

Thanks

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#!/bin/bash

# Root Backup Script


#The source directory:
SRC="/"

#The target directory:
TRG="/media/root-backup/"

#The rsync options:
OPT="-av --numeric-ids --delete --delete-excluded --filter=merge_/root/bin/root-filter-rule"

#Execute the backup
rsync $OPT $SRC $TRG