I have a backup .dbk file from my X30 'High', which I am selling tomorrow and instead am buying the X51v.
So my question is: will I be able to use this backup .dbk file that I made on my X30 to restore everything from it and onto my brand new X51v? Or will this .dbk file be useless?
In that case - what would be the best way to backup everything in a single file from the X30, so that i could restore it onto my X51v?

I doubt it. X30 runs WM2003SE whereas X51v runs WM5. Even if a particular utility alllwed this, I would avoid it as surely you will not get a clean restore. You also want to start fresh with a new device.

To backup, make sure you sync everything you need to Outlook, and copy all the files you have in internal memory (e.g., Main Memory & BIS) to memory card or your PC. The programs you will need to reinstall.

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Got it! Thx!