pg_start_backup - backups

Attempting to run a backup with the database online. I first issue
'PG_START_BACKUP', then copy the contents of the postgresql data folder,
then issue 'PG_STOP_BACKUP'. The database service remains running during the
copy. If queries continue to hit the database after the PG_START_BACKUP
command is issued changes to the data folder are possible, which can cause
copy errors (for instance, a file not found exception). The file copy method
first creates a string array of the data folder contents (all folders and
files) and then processes the array, copying one file at a time. What am I
doing wrong?

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