Normally migrating data from an older, smaller SD card to a bigger one on any Android phone is a simple affair:

• Connect USB cable to phone
• Choose “Connect as drive” on phone
• Backup files from USB device onto PC/Mac using your favourite file manager on your PC/Mac
• Disconnect device from PC/Mac
• Disconnect USB cable
• Unmount SD card (Main menu -> SD card storage -> Unmount
• Replace old SD card with new SD card
• Reconnect USB cable
• Choose “Connect as drive” on phone
• Copy data back
• Disconnect device from PC/Mac
• Disconnect USB

All well and good, nice and simple.
BUT! What if you’ve been toying with your phone and flashing custom roms and, here’s the big one, what if you have apps2sd enabled?  Those apps are installed on an ext partition which you can’t just easily get access to.

Well, it’s not that difficult actually. Two assumptions here are that you’ve rooted your phone, and also installed (a relatively recent) version of the Amon Ra Recovery Image for your phone.
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