[rdiff-backup-users] backing up to external disk

[Montse - CRIC]

Hello,

I've just started using rdiff-backup. I used an external disk as target 
directory by doing this:

rdiff-backup  source  /media/TOSHIBA/target

and the program told me this:

Warning: hard linking not supported by filesystem at 
/media/TOSHIBA/backup/rdiff-backup-data

Does this mean I'm loosing some of the features of rdiff-backup?

Another question: I would like to create a script that runs rdiff-backup 
once a week. How can I do it? I'm working in Ubuntu

Many thanks
Montse