HASS Core Backup: unknown error / backup with terminal?

HASS Core 2023.7.3 (without Docker/Cont. Manager)
OS: Synology DSM 7.2
I’m logged in with Win11/Firefox. When trying to create a backup I get:

grafik

HASS still indicates creating a backup(Sandclock) an a file is created with 10240B, always the same (which is way to little).
Error Log:
Error handling message: Unknown error (unknown_error) XXX from 11.222.11.222 (Mozilla/5.0 (Linux; Android 13; SM-T870 Build/TP1A.220624.014; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/122.0.6261.64 Safari/537.36 Home Assistant/2024.1.5-12102 (Android 13; SM-T870))
[139927490678928] Error handling message: Unknown error (unknown_error) XXX from 11.222.11.222 (Mozilla/5.0 (Linux; Android 13; SM-T870 Build/TP1A.220624.014; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/122.0.6261.64 Safari/537.36 Home Assistant/2024.1.5-12102 (Android 13; SM-T870))
[139927664087184] Error handling message: Unknown error (unknown_error) XXX from 11.222.11.222 (Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36)
Traceback (most recent call last):
File “/volume1/@appstore/homeassistant/env/lib/python3.11/site-packages/homeassistant/components/websocket_api/decorators.py”, line 26, in _handle_async_response
await func(hass, connection, msg)
File “/volume1/@appstore/homeassistant/env/lib/python3.11/site-packages/homeassistant/components/backup/websocket.py”, line 70, in handle_create
backup = await manager.generate_backup()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “/volume1/@appstore/homeassistant/env/lib/python3.11/site-packages/homeassistant/components/backup/manager.py”, line 192, in generate_backup
size_in_bytes = await self.hass.async_add_executor_job(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “/var/packages/python311/target/lib/python3.11/concurrent/futures/thread.py”, line 58, in run
result = self.fn(*self.args, **self.kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “/volume1/@appstore/homeassistant/env/lib/python3.11/site-packages/homeassistant/components/backup/manager.py”, line 244, in _mkdir_and_generate_backup_contents
atomic_contents_add(
File “/volume1/@appstore/homeassistant/env/lib/python3.11/site-packages/securetar/init.py”, line 188, in atomic_contents_add
atomic_contents_add(tar_file, directory_item, excludes, arcpath)
File “/volume1/@appstore/homeassistant/env/lib/python3.11/site-packages/securetar/init.py”, line 188, in atomic_contents_add
atomic_contents_add(tar_file, directory_item, excludes, arcpath)
File “/volume1/@appstore/homeassistant/env/lib/python3.11/site-packages/securetar/init.py”, line 191, in atomic_contents_add
tar_file.add(directory_item.as_posix(), arcname=arcpath, recursive=False)
File “/var/packages/python311/target/lib/python3.11/tarfile.py”, line 2179, in add
with bltn_open(name, “rb”) as f:
^^^^^^^^^^^^^^^^^^^^^
PermissionError: [Errno 13] Permission denied: ‘/volume1/@appdata/homeassistant/config/custom_components/default_config_disabler/config_flow.py’

I checked File ownership, is the same as all other files around.

It would be wonderful if I could solve this problem, but maybe somebody has a suggestion how to backup/restore manually (using terminal/putty).
Thanks

ha backups new

Sorry, I don’t understand

That is the command you use via the terminal.

I tried, my OS is synology dsm7.2. Answer was : commmand not found

Does this require hass-CLI?

Yes.

Hass-cli is not availlable yet. Not shure I can install it on the synology propriatary linux.