That depends on what DBMS you're using, and to some extent also on how you're managing it.
For MySQL/MariaDB you can backup a single table on the commandline like this:
mysqldump --opt -u DB_USER DB_NAME TABLE_NAME >table_dump.sql
and restore it like this:
mysql -u DB_USER DB_NAME <table_dump.sql
Replace DB_USER, DB_NAME and TABLE_NAME with the correct names for your system(s).