Python: PermissionError: [Errno 13] with copy_tree function in windows - python-3.x

Question

Im just copying all files and subfolders from an specific directory using the function distutils.dir_util.copy_tree in Windows:
from distutils.dir_util import copy_tree
from datetime import datetime
directories_to_backup = {
'folder_a' : 'e:\\folder_a',
}
now = datetime.now()
backup_name_folder = now.strftime("%Y%m%d-%H%M")
for name_folder, path_folder in directories_to_backup.items():
print(f'Backuping up the folder {name_folder}')
backup_full_path = f't:\\zzzBackup\\{backup_name_folder}\\{name_folder}\\'
copy_tree(path_folder, backup_full_path)
it works fine till it get to some specific file and rise the following error:
Traceback (most recent call last):
File "C:\Users\UserR\AppData\Local\Programs\Python\Python37\lib\distutils\file_util.py", line 48, in _copy_file_contents
buf = fsrc.read(buffer_size)
PermissionError: [Errno 13] Permission denied
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:/Users/UserR/PycharmProjects/my_scripts/main_backup.py", line 28, in <module>
copy_tree(path_folder, backup_full_path)
File "C:\Users\UserR\AppData\Local\Programs\Python\Python37\lib\distutils\dir_util.py", line 159, in copy_tree
verbose=verbose, dry_run=dry_run))
File "C:\Users\UserR\AppData\Local\Programs\Python\Python37\lib\distutils\dir_util.py", line 159, in copy_tree
verbose=verbose, dry_run=dry_run))
File "C:\Users\UserR\AppData\Local\Programs\Python\Python37\lib\distutils\dir_util.py", line 159, in copy_tree
verbose=verbose, dry_run=dry_run))
[Previous line repeated 1 more times]
File "C:\Users\UserR\AppData\Local\Programs\Python\Python37\lib\distutils\dir_util.py", line 163, in copy_tree
dry_run=dry_run)
File "C:\Users\UserR\AppData\Local\Programs\Python\Python37\lib\distutils\file_util.py", line 151, in copy_file
_copy_file_contents(src, dst)
File "C:\Users\UserR\AppData\Local\Programs\Python\Python37\lib\distutils\file_util.py", line 51, in _copy_file_contents
"could not read from '%s': %s" % (src, e.strerror))
distutils.errors.DistutilsFileError: could not read from 'e:\folder_a\0\binlog': Permission denied
Process finished with exit code 1
How can I update the permissions in windows so my script would be able to read and copy the files?