[rdiff-backup-users] Using --force all the time with automatic backup

[Cybertinus]

Hello everybody,

I've written a script for backing up my desktop computer at home. I've 
got a few directories I find very important and the data in there also 
changes a lot (like the directory which contains my e-mail). So I backup 
that every hour. This script creates increments of the directory and 
saves old increments for 2 days.
But my desktop isn't turned on 24/7. I turn it off every night.
When I turn it back on, then my script runs a backup again. And when it 
runs rdiff-backup --remove-older-than 2D 
"/backup/snapshots/home/cybertinus/mail" it finds a lot of old 
increments. I get something like the following error:

"Starting backup of /home/cybertinus/mail at Fri Jun 12 10:00:32 CEST 2009
Fatal Error: Found 5 relevant increments, dated:
Wed Jun 10 01:00:51 2009
Wed Jun 10 06:00:43 2009
Wed Jun 10 07:00:53 2009
Wed Jun 10 08:00:51 2009
Wed Jun 10 09:00:44 2009
If you want to delete multiple increments in this way, use the --force.
Done backing up /home/cybertinus/mail at Fri Jun 12 10:00:49 CEST 2009"

(the first and last line of that message are generated by my script ;) )

So I must use --force manually then. I don't fancy doing this manual 
action every day for multiple directories. I've created a cronjob to get 
this done automatically every hour with a reason ;).

So my question: can it do any harm when I change the command in the 
cronjob to a version with --force in it by default?
I've found the warning in the manpage, but I can't really tell if it 
really isn't smart to use it automatically. Every time I used it 
manually it ran without problems.

Thnx for your reply's :).

Regards, Cybertinus