Sure! Here's a sample bash script that should copy files from a local directory to a network share folder and only copy new files:
```
#!/bin/bash

# Set the source and destination directories
src_dir="/path/to/local/directory"
dest_dir="/path/to/network/share/folder"

# Get the current date and time
current_time=$(date +"%Y-%m-%d_%H-%M-%S")

# Create a log file to keep track of copied files
log_file="/path/to/log/file_$current_time.log"
touch $log_file

# Loop through each file in the source directory
for file in $src_dir/*; do
  # Get the filename and check if it already exists in the destination directory
  filename=$(basename "$file")
  if [ ! -f "$dest_dir/$filename" ]; then
    # Copy the file to the destination directory and add it to the log file
    cp $file $dest_dir
    echo "Copied file: $filename" >> $log_file
  fi
done
```
To schedule this script to run at 11 PM every day, you can use the cron utility. To do so, open your terminal and type:
```
crontab -e
```
This will open the cron file in your default editor. Add the following line to the end of the file:
```
0 23 * * * /path/to/backup/script.sh
```
This will run the backup script at 11 PM every day. Make sure to replace /path/to/backup/script.sh with the actual path to your backup script.

Note that this is just a sample script, and you may need to modify it to suit your specific requirements.
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