Can you elaborate more? I think the cron-solution will be unable to synchronize with your application code to determine when to stop writing, so more background and your solution would be of interest.
As I understand it, while you do the backup, other writes should go to the WAL log and only get commited until after the backup?
As I understand it, while you do the backup, other writes should go to the WAL log and only get commited until after the backup?