Android Question Backup confidential files (best solution?)

Fab117 · Dec 20, 2015

Hi,

My app is saving pictures and a database on my SD-Card.

With the help of Klaus, the app can perform a backup of those files in my DropBox.

However, I am not comfortable to let those data's unencrypted in the Cloud.

The solution I thought:

Each file is zipped (with password protection) and then send to my DropBox
The files are transferred by FTP on a safe drive (and not to the DropBox)
The files are transferred on my personal computer (Windows 7) (which is on line backed up on a safe external drive)

I haven't seen anything on the forum for solution 1).
It seems that FTP transfer is quite complex (I am definitely not fluent with B4A).
If I correctly understood, solution 3) could be performed using AsyncStreams

Is there someone that could help me to know:

first: if I missed an easiest way to backup those files (in a safe way)?
then: is it correct that solution 3 would be easier to implement than the 2 first ones?
finally: is there a tuto on how to implement AsyncStreams in my code and on my PC?

Thank you in advance for your support.

Fab

Roycefer · Dec 20, 2015

Is your intention that this backing up can be performed even if your phone and Windows computer are not on the same local network? If so, I think you'll find it easier to implement a rudimentary B4J server and use multi-part POST to upload files from the phone to the http server running on your Windows computer. There's a little set-up you'll have to do to get your server visible from the outside: https://www.b4x.com/android/forum/t...p-to-your-b4j-server-over-the-internet.37201/ but once you get it running, it's quite reliable and easy to manage. You can also zip and/or encrypt your files before uploading, for extra paranoia.

JohnK · Dec 21, 2015

Using RAID (above 0) will increase the stability/reliability of the files themselves on your computer drive. Using HTTPS or SFTP will increase the security of the transfer itself.

Erel · Dec 21, 2015

Roycefer said:
Is your intention that this backing up can be performed even if your phone and Windows computer are not on the same local network? If so, I think you'll find it easier to implement a rudimentary B4J server and use multi-part POST to upload files from the phone to the http server running on your Windows computer. There's a little set-up you'll have to do to get your server visible from the outside: https://www.b4x.com/android/forum/th...p-to-your-b4j-server-over-the-internet.37201/ but once you get it running, it's quite reliable and easy to manage. You can also zip and/or encrypt your files before uploading, for extra paranoia.

Note that this B4J example doesn't use the multi-part protocol (there is no good reason to use this protocol unless you want to upload files from the browser).

KMatle · Dec 21, 2015

If you do it for customers I would get a own Server (5-10€ a month) and use B4x-Encryption with RSA and store it on this server.

My solution (no zip):

- create a unique pw for each file (50-100 chars Long)
- encrypt the pw with RSA
- upload the file to your server
- store the pw in a MySQL-DB (decrypted)
- each Client must give a userid & pw

If you do it for your own privacy I would just copy the files to my pc and zip-encrypt it...

Fab117 · Dec 21, 2015

Hi everyone.

Thank you very much for all your answers.

But I am still a little bit confused.

@Roycefer: No my purpose (for solution 3 => backup on my personal computer) would be to perform the backup when both (my Android device and my PC) are connected to my private network.

@Erel: Which solution would you recommend (for a B4A novice)

@KMatle: I like this solution (even if I have to pay 5-10 € a month), but is there a tuto to explain how to proceed? I take a look to the RSA one attached to your signature, but it seems a little bit complicated for me.

Thank again for your support.

Fab

Erel · Dec 21, 2015

There are many possible options. Sending files with FTP is very simple.

You can also use a solution such as this one: https://www.b4x.com/android/forum/threads/37201/#content

Fab117 · Dec 22, 2015

Hi Erel,
Thank you for the answer and the link to the tuto.

I installed B4J without any issue.
Then I created an account at Duck DNS. But before using it, I have a question (I am not familiar with network).
I alreay have an account at no-IP that I use for my camera. Could I use it ?
Otherwise, I don't know if with my router (FritzBox 7490) I can create a second DNS account:

=>
1) Do you know if I can have 2 dyn DNS on my routeur?
2) If it is not possible, can I configure your example file with my no-IP account?

Regards,

Fab

Erel · Dec 23, 2015

The example from the link I posted, updates the dynamic dns server internally. You do not need to configure the router for this.

For further discussions please start a new thread in the B4J forum.

Fab117 · Dec 23, 2015

Hi Erel,
Thank you for the answer.
I am a little lost with it. But I will think about it and come back in a new thread when it will be clearer.

Merry Christmas.

Fab

Android Question Backup confidential files (best solution?)

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