Using the --one-file-system option, the tar method fails to back up files in
the target subdirectory of a mounted partition. It backs up directories without
their files, unlike the rsync method using the --one-file-system option, which
works as expected.
I checked the log to verify that the tar command was correct. No errors were
indicated.
I don't have a small enough partition to see whether this happens when
an entire partition is the backup target, and is implied to work by the
following comment in config.pl:
# On the other hand, if you add --one-file-system to $Conf{TarClientCmd}
# you can backup each file system separately, which makes restoring one
# bad file system easier. In this case you would list all of the mount
# points here, since you can't get the same result with
# $Conf{BackupFilesOnly}:
#
# $Conf{TarShareName} = ['/', '/var', '/data', '/boot'];
That is what I tried except that my back up target was a subdirectory
of a mount point. The tar man page does not explain it, and seems to
imply that it should work as expected:
-l, --one-file-system
stay in local file system when creating an archive
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