Is it safe to run a periodic task created with NewPeriodicTask2() during a text backup?

Example 1:
Periodic task starts deleting records in a loop and then a Daily backup is started.
Will periodic task routine be suspended while the Daily backup is being run?
If periodic task routine will be suspended will it resume after the Daily backup is finished?

Example 2:
Daily backup is running and then a periodic task should start.
Will periodic task be executed or ignored until the timer triggers it at the next scheduled time?