Data Transfers · Scheduling transfers
Why did my scheduled transfer run immediately instead of at the time I set?
Short answer: By design, the first run happens as soon as you click Start Transfer, so you get a working copy straight away. After that it follows the schedule shown as Next run.
That's by design: when you click Start Transfer, the first run happens straight away, so you know the transfer works and get a copy now. From then on it follows the schedule — the Next run time you saw in the sheet.
If you'd rather it didn't run until the scheduled time, the simplest way is to set it up close to that time; there isn't a separate "don't run now" option.
Related: Schedule a transfer