In article 2015071210474444272-savageduck1@REMOVESPAMmecom,
Savageduck wrote:

I upload to Lightroom, note that the images have all been uploaded,
and then close Lightroom. Lightroom backs-up when closed because it
it set to back-up each time it's closed.

do you have it set to copy that 'backup' to a different drive not in
the computer?

Remember, that is only the LR backup catalog, for adjustments, edits,
and metadata, not an image file backup.

i said that below.

if not, then it's not a backup. it's just wasting time and space on
your drive.

The LR backup catalog file is like an OSX recovery partition, and does
not take up much space, but it should also be part of a backup/archive
plan. It is usually zipped and depending on your LR content somewhere
between 50-300MB.

it can take up a fair amount of space depending on previews and a good
backup strategy would include the lightroom catalog anyway.

it also takes time to do each time when quitting the app and if you
don't quit the app it won't be done.

more importantly, lightroom does not back up the photos, which is the
important part. the catalog can be recreated but the photos almost
always cannot.

Exactly, hence a seperate backup of actual image files should be
maintained, or you have no backup at all.

yep

Images are uploaded to a file on D:, and the D: drive is backed up to
an external drive every night.

leaving you vulnerable for as much as 23 hours.

...but there is still a backup of originals which is more than many
folks ever do.

true, but the point is that there's as much as a 23 hour window where
something could fail.

the backup should be done immediately, or at least every hour such as
with time machine.