This little article contains some useful tips and tricks about using tar.

When your starting point for the tar is situated at /, you may already have noticed the warning output from it:

Quote
tar: Removing leading `/' from member names

In case of an automated backup, where the tar is executed using cron, this warning quickly becomes annoying: most systems mail the output of a cron job to a specified email address (and in any normal scenario, this is configured properly to know whether a backup succeeds or fails). If each time you get a mail with only this warning (the rest of the backup was succesfully completed), one might actually lean towards suffering from a nervous breakdown (if only  ...