[Bug] Attempting to restore an encrypted backup without providing the password / key doesn't result in any useful errors #1052

Guidelines

• I have read the FAQ and it doesn't cover the issue.
• I have searched the issue tracker for open and closed issues that are similar to the feature request I want to file, without success.
• I'm on the latest version.
• I'm not using a test build (alpha/beta/release-candidate).
• This issue contains only one bug.

Describe the bug

Reproduction steps:

1. Install Neo Backup on a fresh installation.
2. Point it to a previously created encrypted backup directory.
3. Attempt to restore apps with data.

Actual behaviour:

• The restore gets stuck at 0% with status "=d" in the notification.
• The app gets restored but not the data.
• No logs are emitted about the reason for the failure (at least none that I could find with adb logcat)

Nothing obviously indicates you need to go to Settings --> Service --> Encryption and specify the password / key you set for the backup.

Expected Behavior

The app prompts you for the encryption password / key or at least provides an error in the notification stating that the encryption details were not provided.

Neo Backup's Version

8.3.18

Installation Source

Github/Codeberg/Gitlab releases

Last Known Working Version

N/A

Relevant information

• Device: Redmi Note 10 Pro
• Android Version: 15
• ROM: LineageOS 23.2

First of all, this is obviously a UX issue, not a code functionality bug, feel free to re-classify this as a feature request if you feel it is more appropriate.

However, I personally feel this is probably better classified as a bug considering how unintuitive it is to realize you need to provide the encryption key.

Most people performing a restore probably set up Neo Backup months (possibly years) earlier and may not immediately remember that they set an encryption password / key, especially with the encryption nag having been removed in 8.3.18. I didn't realize that was the actual reason for the failure until I started looking into the actual .properties files, saw the encryption algo / IVs and realized I didn't set a password for decryption anywhere.

Thanks for spending your time on developing and maintaining Neo Backup, putting aside this one minor issue its been a great app.