[stocktiki]

Hello. I own a Lumia 520 and just bought a Lumia 640.

When I setup the 640 - if I restore the backup - will that interfere with the 520 in any way. Also, will a conflict arise if both phones are creating backup files?

[pdaneophyte]

Turn off application & setting backup on both.

[RumoredNow]

Turn off application & setting backup on both.

Negative. You are denying a huge cloud function.

You can put the old phone backup on the new phone and save some time. You'll get everything that has not expired like out of publication Apps and messages/emails from before the show X amount of time period.

Thereafter, each phone will go its separate way on backup/restore.

[pdaneophyte]

My understanding of his intention is: He wishes to use the same profile on both phones at the same time. So, due to screen size difference, I wouldn't backup same setting (2 column & 3 column start page).

[juanitoriv]

Hello. I own a Lumia 520 and just bought a Lumia 640.

When I setup the 640 - if I restore the backup - will that interfere with the 520 in any way. Also, will a conflict arise if both phones are creating backup files?

No, it won't mess up your 520. Just make sure its name is how you want it (plug into PC & name in Explorer), & is recognized on the windowsphone.com website before you go to back-up on the phone to do a manual sync.

[RumoredNow]

Unless you are backing up 2 different configurations on 2 handsets of the same model, there should be no issue. And that issue can be solved by giving the phones unique names as described above.

The OP asks about setup. Anything done during setup to use an old phones profile is a one off. It won't keep sending the changes made on the 640 to the 520 during each backup/restore. They will remain separate even sharing the same Microsoft Account.