Is it safe to continue an incomplete tar job?
Background: I was doing
tar -czvf backup_20091013.tar.gz directory1 directory2 ... > tar_log_20091013.txt
and to be safe, I put the shell window on the second desktop. A couple of hours later, I logged out (thinking that there was nothing running!), which seems to have stopped the tarring and gzipping. It got most of the way through, so I'm half-tempted to continue that job. Is there a risk of corruption (either to the whole archive, or the archived copy of the file being tarred and gzipped at the time I logged out)?