settings.pl: generic config file: in particular, the name of the tape
device is set here.
+settings.sh: generic config file for shell scripts. Currently only
+contains some options for the lvm snapshotter.
+
tape.*: conventionally, each tape you're going to use in the backup
cycle has a tape number, a name and a config file. The tape numbers
in use at Relativity are digit strings like `512'. The name is a
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>.
-The only currently support option is gz[=<compressionlevel>], to
-indicate that the whole stream should be compressed with gzip. The
-compression level defaults to 1.
+Options supported:
+
+ gz[i][=<compressionlevel>]
+ Indicates that the whole stream should be compressed with gzip.
+ The compression level defaults to 1 if gz is specified by the
+ level isn't. gzi appliies only to the incrementals; gz applies to
+ both unless gzi is also specified. compression level 0 means not
+ to run gzip at all and is the default if gz[i] is not mentioned.
+
+ snap=<snapkind>
+ 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.
expected-diffs is a config file to indicate which
filesystems should *not* be backed up. The scripts do a config