[android-developers] android offline synchronizing app/tool

Hello,
I am looking for an offline synchronizing tool/app/client for android
devices.
It can be used to take backup of
1. Contacts
2.Messages
3.Photos & Videos
4.Calender.

It should be able to backup this data using one or more of these:
1.USB
2.WIFI
3.BLUETOOTH
4.HTTP

Also, I am looking for such a tool specifically for Linux machines.

The reason for this is to avoid sending data to the cloud during
backup for privacy reasons.

Actually I am developing such a cross platform compatible offline
synchronizing tool myself. But I want to know if this already exists.
I couldn't find anything like this in the market or anywhere else.

Thanks.

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