Backup: bandwidth throttling with cstream

I noticed last night that my disk IO usage was 100% and server was hardly working. I saw the ispconfig backup is to blame.

To fix this I propose to use ctream bandwidth throlling.

Example

Install cstream

apt-get install cstream
```
Run command with bandwidth limit of `777k`

tar cj file.txt | cstream -t 777k | tar xj -C /tmp/