The file (including any included files) must end with the word 'end'
on a line of its own.
-Valid values for <backup-type> are `cpio' (uses cpio to produce
-tar-format backups), `dump' (uses dump to dump entire filesystems;
-<directory name> should be a mount-point for this), `zafio' (uses afio
-to compress each file as it is backed up), and `ntfsimage' (for NTFS
-volumes, requires device name). Only `dump' type backups perform
-incremental backups.
+Valid values for <backup-type> are
+ cpio
+ uses cpio to produce tar-format backups
+ dump
+ uses dump to dump entire filesystems
+ <directory name> should be a mount-point
+ gtar
+ uses GNU tar to produce GNU tar format backups and -N-based
+ semi-incrementals (not --incremental or --listed-incremental)
+ zafio
+ uses afio to compress each file as it is backed up
+ ntfsimage
+ for NTFS volumes, requires device name
+Only `dump' and `gtar' type backups perform any kind of incremental
+backups.
<options> is a comma-separated list of <option> or <option>=<value>.
Options supported:
Indicates that the filesystem should be frozen before the backup
by using /etc/chiark-backup/snap/<snapkind>. See the head comment
in /etc/chiark-backup/snap/lvm for details of how this works.
+ When snap= is used, the block device must be specified.
+
+ noinc
+ Suppress incrementals.
expected-diffs is a config file to indicate which
filesystems should *not* be backed up. The scripts do a config