postgres backup for specific table with blob oid
The oid column are avaliable in all tables, and I believe thats not a issue.

To create a logical dump of this table, you just need add a option -b (or --blobs in the pg_dump arguments, eg:

pg_dump \
  -U user\
  -t table_name \
  --blobs \
  -f dump_file_name \
  database_name


Another options will be useful is the -F c (or --format=custom) to change the default format from plain to custom.

Please take a look at the documentation for more details:
https://www.postgresql.org/docs/current/static/app-pgdump.html