If you are using primary computer as soon as "Update" to device software becomes available in Zune it will take a backup.
Symbian specialist until 31/01/2013 with interests in Maemo & MeeGo but an aversion to Windows!
2012-04-06 8:00 - last edited on 2012-04-06 8:04 by haZey
could anyone explain what is Lumia 800 Backup.
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Same as any backup, it's a copy of all data on the device. You could use it for restoring the device after a reset, revert or just have it for safety resons.
I feel your pain. I too searched for that option in Zune but to no avail. I plugged the same phone into my MAC using the Apple equivalent of Zune and the option was there. What's that about? And you know (on MAC) that something is happening because it warns that your phone will shut down and restart (not sure why). When it does that there's a "progress bar" along the top of the phone's screen that you wouldn't have seen before. Conclusive proof your phone's been backed up and none of the guesswork Zune leaves you with.
My advice to you?
Get a MAC to back up your Windows phone ;-)