What is the best cloud storage encryption tool that when you change files, the cloud storage program won't re-upload the whole container/volume and is stable? Preferably with an Android app.
Please add it's ok if it's experimental but as long as there's little to no risk of losing my files (such as getting locked out of files).
I don't know what the best tool is. I have been playing with CryptSync (uses 7-Zip to compress and encrypt). http://stefanstools.sourceforge.net/CryptSync.html
There was a related discussion on this about a year ago - sorry, I couldn't locate it. Some people like Duplicati, this is a cloud backup tool; but is not Android.
Thank you everyone. Sorry for the late reply. What's the advantage and disadvantage of "Use GnuPG for encryption" and difference between having it enabled or disabled? Same with use .7z instead of .cryptsync? Same with FAT filesystem workaround? If I modify a file on one computer, then go on another, will it decrypt and decompress that file on that computer?
I think what you are looking for is Boxcryptor https://www.boxcryptor.com/en/boxcryptor Uses existing cloud storage providers such as Box, Google Drive,etc. and has an android app. Files are encrypted on the fly with AES256 and RSA Encryption and does not create containers. It encrypts individual files. It creates a virtual drive on your pc and all files are encrypted locally before being uploaded. It is also free for personal use.
Oh yeah, I forgot to mention please suggest free ones if a mod sees this please add to my original post. If I needed to use a third device, would I be able to temporarily disable a device to free up a spot remotely?
Let me see what I can help you: I think the question of GPG vs AES-256 (7z) is purely personal. Both offer strong encryption, I particularly prefer AES, since I use it on my Veracrypt containers. About using .cryptsync does it would hide that the file is a .7z, I do not see anything else. I don't know, but I leave it enabled. Yep! Sorry for my bad english!
So for it to decrypt and decompress, I would just have to use the same password when making the pair on the second computer?
Yep! I think one important thing is that the Cryptsync is fully FOSS (Free Open Source Software). This is essential in an encryption program, as it is the only way to know that there is no backdoor. See if past alternatives here are also FOSS, this should be put in the balance.
There is no mention that the free service is limited to an x number of devices. If you read through the website and the technical usage info im sure it will answer all of your questions. regards.
There's cryptomator, but it's still beta (alpha?). There's also encfs, but their encryption implementation is not rock solid and so you should not use it. For those recommending, please mention if it's linux compatible.
This seems to be a very interesting project! I will follow it. Especially to be compatible with Linux. Thanks!