Hi all into my server linux with Ubuntu10 in etc/crontab I have this:

```
0 0 * * * user rdiff-backup -v9 user@111.111.111.111::/var/www/ /mnt/server1/www
0 1 * * * user rdiff-backup -v9 user@222.222.222.222::/var/www/ /mnt/server2/www
0 2 * * * user rdiff-backup -v9 user@333.333.333.333::/var/www/ /mnt/server3/www

```

The server has an hard disk of 2Tb for example and with my backup I have occupied 1Tb about.  

I done the backup every night, now if for an year or more this backup work the space of my hard disk I think that decrease because rdiff-backup make history of changed file.  

Is possible to limit into my crontab to limit the history and mantain controlled the space of the hard disk? Something like: "after 30 version cancel the oldest".  

is possible to do it into my file crontab?