I am using backuppc 4.3.0 to backup an Ubuntu 18.04 Linux server using
rsync.

1 get the following (unexplainable) rsync errors:

[1] file has vanished: "/etc/apt/apt.conf.d/20archive.~1~

    This file which seemingly refers to an emacs backup file, has not
    existed on my server for months, Since I have neither touched nor
    edited 20archive in months, I don't know why backuppc is finding
    it and then saying it vanishes.

[2] rsync_bpc: fstat "/usr/lib/cgi-bin/nut/upsimage.cgi" failed: No such file 
or directory (2)
    rsync_bpc: fstat "/usr/lib/cgi-bin/nut/upsset.cgi" failed: No such file or 
directory (2)
    rsync_bpc: fstat "/usr/lib/cgi-bin/nut/upsstats.cgi" failed: No such file 
or directory (2)

    None of the files are backup up despite existing (and continuing
    to exist on the server

    #ls -al /usr/lib/cgi-bin/nut
    total 132
    -rwxr-xr-x 1 root root 41080 Nov 15  2017 upsimage.cgi*
    -rwxr-xr-x 1 root root 43096 Nov 15  2017 upsset.cgi*
    -rwxr-xr-x 1 root root 43856 Nov 15  2017 upsstats.cgi*

[3] Similarly, for the 206 files in the directory /usr/lib/grub/x86_64-emu
    rsync_bpc: fstat "/usr/lib/grub/x86_64-emu/adler32.mod" failed: No such 
file or directory (2)
    rsync_bpc: fstat "/usr/lib/grub/x86_64-emu/affs.mod" failed: No such file 
or directory (2)
    rsync_bpc: fstat "/usr/lib/grub/x86_64-emu/afs.mod" failed: No such file or 
directory (2)
    rsync_bpc: fstat "/usr/lib/grub/x86_64-emu/all_video.mod" failed: No such 
file or directory (2)
    rsync_bpc: fstat "/usr/lib/grub/x86_64-emu/archelp.mod" failed: No such 
file or directory (2)
    ...


Note all the above problems recur on every nightly backup, so it
doesn't appear due to any transient issue.

Interestingly, the backuppc status page shows only one error
(presumably #1 above) but doesn't count the 209 (3 + 206) other errors
where rsync_bpc says No such file or directory.

So:
1. Why are non-existing files being found on the server? [1]
2. Why are existing files not being found by rsync_bpc? [1], [2]
3. Why is backuppc not counting "No such file or directory" errors as
   errors?



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