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Leon I was happy to see that Telstra gave u back the 4GBs inadvertently used.
Sounds like an OS upgrade but also if it has Navigation software it may have downloaded the maps.
Mine (Navigon) downloaded the NZealand maps (450MB) on start up and I had to then get the Australian ones. Weird how a Nav program couldn't tell I was in Tasmania. All up that was 1GB gone.
I think backing up to you computer or a USB drive is the safest option in terms of preserving your Internet allowance, although I have found cloud storage useful at times (Dropbox) and use it on my Netbook/tablet/PC and phone I don't try to maintain a full system back up because the cost would be steep interms of upload/download. Anyway access info backed up to USB is faster.
Luck with it, they seem like a nice gizmo.
Trevor
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