Agree on the CD/DVD. Always burn two, and always buy your own media.
Regarding the failing units: they may have failed due to too high, but also too low voltage. Both can damage the electronics as well as the batteries. For critical travel backup in any part of the world where the electric supply is unreliable, I would choose a drive that accepts AA's, which are charged outside the unit in a separate charger.
The Hyperdrive
http://www.hypershop.com/shop/index.php runs on different energy sources, an external pack that takes 4 AA's being one of them. It's also very fast for transfers. They used to be available in Singapore, but I haven't been there in ages, and I haven't seen them here in Thailand.