Hello,
Disclaimer: I do not use and am not familiar with Sinology hardware and
software and generally speaking, I am not knowledgeable in networking
I would say that:
- the owner:group names of a file on the PC you backup and the
owner:group names of the backup files on the synology files might be
different, even if you try to maintain ownership and rights. What really
counts here are owner:group identifiers (UID:GID). Bob_user:Bob_group on
your PC might equate to Alice_user:John_group on your NAS. Upon
restoration that would be reversed to Bob_user:Bob_group.
That would be typical without something like a LDAP server.
- SSH root login seems to be discouraged for security reasons. Sinology
probably adhere to this principle and the appropriate way to do what you
want would probably be to access a shell on the Synology software to
issue a sudo or su -c command.
- editing /etc/sudoers is generally done via the visudo command
- if that is of interest to you, there is a way to install Debian in
chroot on your NAS
