When Redis is configured to use an ACL file (with the
option), this command will save the currently defined ACLs from the server memory to the ACL file.
OK on success.
The command may fail with an error for several reasons: if the file cannot be written or if the server is not configured to use an external ACL file.
> ACL SAVE +OK > ACL SAVE -ERR There was an error trying to save the ACLs. Please check the server logs for more information