Database backups - Dangers?

[Martin Dashper]

I wish to perform timed backups of my database using the timer event.
Since the event is independent of whatever code is running at the
time, are there any data loss issues with this idea.
If a table is being written to when the timer event triggers, will the
writing of the data continue when the event has finished, ready to be
backed up at the next timer interval or will the unwritten data be
lost?

Martin Dashper