Issue with incremental backup

I am encountering below error while trying to perform initial backup as a pre-requisite for incremental backup. I am trying this on memsql version 7.0.20 Please advise.

memsql> BACKUP abc WITH INIT TO “/nfs/”;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘WITH INIT TO “/nfs/”’ at line 1

See the syntax here:

The WITH INIT goes after the path.

-Adam