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If you’re transferring to Qatar Avios, there’s no going back.
Once you transfer, it’s done—they are in your Qatar account.
If you cancel a booking, the points will stay in your Qatar account.
I believe they expire in 2 years, but making a small transfer can extend the expiration date.
I’ve had 80,000 Avios in my Qatar account for a year now due to a canceled booking.