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I am running a Raspberry Pi 4 Model B as a VPN Gateway with OpenVPN. On my Samsung S8, I have the app OpenVPN for Android installed and the VPN tunnel to my home network works like a charm.

What I want to achieve now is the following: As my Raspberry Pi has an SD card with huge storage, I want to copy / backup all my images I have on my Android phone to this SD card with the folders being named just like they are on my Android phone.

I saw that rsync can be used maybe. However, I wasn't able to find a proper tutorial for my usecase: I don't want the files on the SD card in the Raspberry to be deleted - never, even when they are deleted on the phone - but only the newer images to be uploaded.

Any idea how I can achieve this?

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    rsync only deletes if you tell it to. – goldilocks Nov 27 '19 at 14:41
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I solved it and thank you goldilocks for your answer.

Android Side

I installed the app Rsync Wrapper on my Samsung and configured it with the following parameters:

Source: /storage/WXYZC-ABCD/DCIM/Camera/

Destination: username@192.168.2.4:~/userS8/

Option: -r --ignore-existing --progress -e "ssh -l username -i /data/user/0/net.letscorp.rsyncwrapper/files/00a00b00-1111-22c3-44de-5fgg6hi7j888.key -y"

The option tag will be created more or less automatically by Rsync Wrapper when you create the SSH key pair.

Raspberry Side

sudo apt-get install rsync

Create the directory .ssh and the file authorized_keys if not already there in ~ (home) username:~/.ssh/authorized_keys

Put the public key from the app Rsync Wrapper into the file authorized_keys and test it with a dry run on Rsync Wrapper.

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