Event replication on slave and Slave_IO_Running:NO
For non-LVM, I recommend doing

STOP SLAVE;  -- before taking the backup
START SLAVE;  -- after taking the backup


This both avoids the problem and avoids other issues.

What kind of backup is it?


LVM "snapshot" -- I recommend stopping mysqld completely.
mysqldump (or similar) -- be sure to add the parameter that says to dump stored routines.  (I think that will capture the EVENT.)