Sql-server – how to update new password in maintenance plan

Is there a SQL event being throw when the snap manager starts the backup? If so there could be an alert setup on that event which is setup to start the job. Check the SQL Agent alerts to see if it is configured to capture anything.

You need to change the appropriate upstream precedence constraint(s) in the flow to On Completion instead of On Success.

This is done one of two ways:

1. Right-clicking the constraint on the design surface (shown below) and selecting the appropriate type from the popup menu.
2. In the Precedence Constraint Editor dialog (which you had open), select the appropriate type from the Value dropdown list.

In earlier versions than 2012, the constraint arrow will turn blue; in 2012, the arrow gets a more explicit "Completion" caption.

Now having said that, if you want to keep all of this in one flow, I would actually recommend using SQL Server Data Tools to create the package, because what you really need is a Sequence Container to put all the maintenance stuff in (keeping the existing On Success constraint types), and then connect the container to the backups task with an On Completion precedence constraint.

Alternatively -- and this is what I would usually do -- separate the backup portion of the process into a different subplan, and schedule it after the maintenance portion is expected to complete.