I managed to track down the source of my original problem, and decided
it was worth posting to the end of this ridiculous thread just in case
it's useful for future googlers. The cause was the empty value - two
quotes at the end of this:

$Conf{RsyncShareName} = [
  '/cygdrive/c',
   ''
];

So don't do this - it causes an otherwise fine backup (AFAICT) to show
on the main status screen as "needing attention", but the only error
in the log is a

Backup aborted ()

at the end.

I believe I may have gotten the syntax from an example of another
rule, perhaps the files exclude, and I believe it might be useful when
you're working with long lists (perhaps externally generated/sorted)
and want to be sure to have a comma at the end of every line.

But not with the RsyncShareName variable. Here is a correct example:

$Conf{RsyncShareName} = [
  '/cygdrive/c'
];

Please don't reply to this unless you feel it's important, e.g.
correcting something for the record. If you want to give me "meta"
feedback - e.g. suggestions for improving the manner in which I
interact with the list - feel free to do so in response to the new
thread I've just started here:
http://blog.gmane.org/gmane.comp.sysutils.backup.backuppc.general

I just can't bear the thought of this one going on any further 8-)

------------------------------------------------------------------------------
Doing More with Less: The Next Generation Virtual Desktop 
What are the key obstacles that have prevented many mid-market businesses
from deploying virtual desktops?   How do next-generation virtual desktops
provide companies an easier-to-deploy, easier-to-manage and more affordable
virtual desktop model.http://www.accelacomm.com/jaw/sfnl/114/51426474/
_______________________________________________
BackupPC-users mailing list
BackupPC-users AT lists.sourceforge DOT net
List:    https://lists.sourceforge.net/lists/listinfo/backuppc-users
Wiki:    http://backuppc.wiki.sourceforge.net
Project: http://backuppc.sourceforge.net/