Backup sync performance over VPN

Attached the current version of the code. It has been extensively tested and fine-tuned.
Backups, which have been transmitted with that method have been successfully restored.

This code might not be perfect but it suits my needs and it doubles my sync performance.

Now, the root cause is still under investigation. Once fixed it will render the script useless.

In the meantime I'm happy with BBS, buffer tuning and the helper script ^_^
 

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