README.md: Fix some "markdownlint" warnings

[backup-script.git] / README.md

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+++ b/README.md
@@ -1,15 +1,24 @@
 # Backup Script
 
-A script for cloning systems using rsync.  
-Copyright (c)2008-2016 Alexander Barton (<alex@barton.de>)  
-Homepage: https://github.com/alexbarton/backup-script
+A script for backing up data using `ssh`(1), `rsync`(1), and `scp`(1).
+Can handle backup generations on *btrfs* and *ZFS*.
 
+Copyright (c)2008-2020 Alexander Barton (<alex@barton.de>)  
+Homepage: <https://github.com/alexbarton/backup-script>
+
+## Installation
+
+Call the scripts located in `./bin` directly from the source folder, or run
+`make install` to install them to `/usr/local/sbin`.
+
+You can set `PREFIX` to use an other path prefix than `/usr/local` like this:
+`make PREFIX=/opt/backup-script install`.
 
 ## Usage
 
 ### backup-script
 
-Backup all or individual systems.
+Run all or individual backup jobs.
 
 Usage: `backup-script [<options>] [<job> [<job> [...]]]`
 
@@ -60,7 +69,6 @@ Options:
 
 When no *job* is given, all defined jobs are checked.
 
-
 ## Configuration
 
 All default configuration variables are read from the first file found of this
@@ -88,7 +96,6 @@ For example:
 - `/etc/backups-script.d/host01.example.net`: configuration for host 1
 - `/etc/backups-script.d/clientXY.example.com`: configuration for host 2
 
-
 ### Global Settings
 
 The following global configuration options exist:
@@ -101,7 +108,6 @@ In Addition, all job configuration options (see below) that have a "default_XXX"
 variant can be used and define default values for all jobs that don't overwrite
 them individually.
 
-
 ## Configuration Variables
 
 ### system
@@ -198,11 +204,11 @@ inside of the target directory.
 
 Supported file systems are:
 
- * *btrfs*:
-   All generations are btrfs subvolumes and named after the date and time.
- * *ZFS*:
-   All generations are ZFS file systems. Latest generation is named `current`,
-   elders are links to the ZFS snapshot directories.
+- *btrfs*:
+  All generations are btrfs subvolumes and named after the date and time.
+- *ZFS*:
+  All generations are ZFS file systems. Latest generation is named `current`,
+  elders are links to the ZFS snapshot directories.
 
 The latest snapshot is always reachable using a symlink named `latest`
 inside the system directory.
@@ -240,14 +246,14 @@ The following job configurations variables used by the outdated backup-pull(1)
 script in job definition files are automatically mapped to the new backup-script
 variables:
 
-* host -> system
-* source -> source_root
-* pre_exec -> job_pre_exec
-* post_exec -> job_post_exec
-
+- `host` -> `system`
+- `source` -> `source_root`
+- `pre_exec` -> `job_pre_exec`
+- `post_exec` -> `job_post_exec`
 
 ## Exit codes
 
+- 0: No error, success.
 - 1: Unspecific Error!
 - 2: Usage information has been shown.
 - 3: Can't read job definition