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EXTREMELY IMPORTANT: Please attach a ZIP file containing your Akeeba Backup log file in order for us to help you with any backup or restoration issue. If the file is over 2Mb, please upload it on your server and post a link to it.

Description of my issue:
I'm having trouble with the command-line backups. If I manually run a backup with my default configuration on my site, the resulting backup can be downloaded and restored in MAMP with no issues.

My automatic nightly command-line backup reports that the status is OK, but the backup can't be restored and gives this error: Invalid header in archive file, part 28, offset 0

I also tried to process the archive using Akeeba extract wizard. It will not process it either.

I don't see any problems in your log file, is this a backup which can be extracted or one that gives you errors?

The backup in your log has 42 parts. For the backups that can't be extracted, are all the parts present when you download them? Is the error always on part 28? Is the part giving the error the same size as the other parts? Only the .jpa part should be a different size.

I'll check tonight's auto-backup and report back if it's the exact same part.

Part 28 is indeed the same size as the others.

So last night it was part 39, so it seems that it's not always the same one.

And now, I ran a manual backup via the back-end and am getting a different error:
Invalid header in archive file, part 3, offset 0

These are all uploading to Dropbox, btw.

That last one was really an invalid header in part 3? That's important because I have an idea, but it involves looking at the files inside the part with the error and I can't find what I'm looking for in part 3.