[add_non_readable_files_to_strict_backup] cause error by file unix socket ( .sock )

[Ohm J]

Hello, I have project to generate websocket connection server. but backup system stop working due

Error copying /home/{USER}/domains/domain.com/public_html/_secret/server.sock  to .... non_readable_files list.

I just temporary fixed by back to use the old method

extra_backup_option=--ignore-failed-read

note# place socket file in "/home/user/_secret/server.sock", the backup working normally. only cause problem when place under domains directory.