> After an hour I finally got my computer back to working properly. It's
> all because of a backup that went to sda1 instead of to an external
> disk. I came home and discovered that the backup had failed due to
> inadequate disk space. A few moments later I confirmed that the hard
> disk was 100% full.
>
> Here are the details:
>
> Backup program is pybackpack, a GUI for rdiff-backup.
> Source: /, with typical exclusions
> Destination: /media/disk2/Full_system_backup/
>
> The computer is a Thinkpad and the external disk is a 500GB disk that
> lives in a carrier that fits into the Ultrabay in place of the CD/DVD
> drive. To make a backup I simply pull out the optical drive and insert
> the 500GB drive. It automounts in a few moments because there is an
> entry in fstab that tells the OS to mount it automatically
> at /media/disk2. Nautilus is happy to let me drag and drop files to and
> from it.
>
> The problem lies in telling rdiff-backup to place the backup on the
> external drive, not on the mount point. I assumed that if Nautilus lets
> me drag and drop files from the 500GB drive that it is mounted. And I
> also assumed that if it is mounted, then any disk writes to the mount
> point would go to the 500GB drive. Evidently I am missing a critical
> bit of understanding about mount and mount points.
>
> Before I try again, can someone explain what went wrong?

the simple issue is probably that the automount magic usually only works 
when someone is logged in and the disk is attached.  what filesystem type 
is on the external drive?
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