diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..1d953f4
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use nix
diff --git a/mpbackup b/mpbackup
index 594526b..0825454 100644
--- a/mpbackup
+++ b/mpbackup
@@ -6,27 +6,17 @@ require 'yaml'
 
 DEFAULT_CONFIG_FILE = Pathname.new('/etc/mpbackup/config.yaml')
 NAME = 'mpbackup'
-VERSION = '0.6.0'
+VERSION = '0.3.0'
 
 def set_restic_vars(config)
-  if config['repository-file']
-    puts "Reading repository from file #{config['repository-file']} …"
-    repo = File.open(config['repository-file'], &:gets).chomp
-  elsif config['repository']
-    repo = config['repository']
-  else
-    error(1, 'No repository has been specified.')
-  end
+  repo = config['repository']
+  puts "Repository: #{repo}"
   if config['password-file']
     puts "Reading password from file #{config['password-file']} …"
     password = File.open(config['password-file'], &:gets).chomp
   else
     password = STDIN.getpass('Please put in your restic password: ')
   end
-  if config['cache-dir']
-    puts "Setting RESTIC_CACHE_DIR to #{config['cache-dir']} …"
-    ENV['RESTIC_CACHE_DIR'] = config['cache-dir']
-  end
 
   ENV['RESTIC_REPOSITORY'] = repo
   ENV['RESTIC_PASSWORD'] = password
@@ -35,13 +25,6 @@ end
 def unset_restic_vars
   ENV.delete('RESTIC_REPOSITORY')
   ENV.delete('RESTIC_PASSWORD')
-  ENV.delete('RESTIC_CACHE_DIR')
-end
-
-def set_restic_path(config)
-  if !config.key? 'restic-path'
-    config['restic-path'] = 'restic'
-  end
 end
 
 def error(exit_status, message)
@@ -49,81 +32,6 @@ def error(exit_status, message)
   exit exit_status
 end
 
-def check(config)
-  puts 'Checking restic repo …'
-  check_command = [config['restic-path'], 'check']
-  puts("Command: #{check_command.join(' ')}")
-  system(*check_command)
-  if $?.exitstatus > 0
-    error(1, "Checking restic repository failed.")
-  end
-end
-
-def backup(config)
-  puts "Backing up with restic …"
-  # https://restic.readthedocs.io/en/latest/040_backup.html#including-and-excluding-files
-  flags = config['backup'].select{|k,v|
-    k != 'exclude' && k != 'paths' && k != 'tags'}
-  flags = flags.map{|k,v| "--#{k}=#{v.to_s}"}
-  exclude = config.dig('backup', 'exclude')&.flat_map{|e| ['--exclude', e]} || []
-  tags = config.dig('backup', 'tags')&.flat_map{|t| ['--tag', t]} || []
-  paths = config.dig('backup', 'paths') || []
-  backup_command = [config['restic-path'], 'backup', *exclude, *paths, *flags]
-  puts("Command: #{backup_command.join(' ')}")
-  system(*backup_command)
-  if $?.exitstatus > 0
-    error(1, 'Failed to do backup.')
-  end
-
-  check(config)
-
-  if config.dig('forget', 'enable')
-    puts 'Forgetting unnecessary snapshots …'
-    flags = config['forget'].select{|k,v| k != 'enable'}
-    flags = flags.flat_map{|k,v| ['--' + k, v.to_s]}
-    forget_command = [config['restic-path'], 'forget'] + flags
-    puts("Command: #{forget_command.join(' ')}")
-    system(*forget_command)
-    # Data will only be deleted when `restic prune` is executed or when
-    # `restic forget` is called with `--prune`.
-    if $?.exitstatus > 0
-      error(1, "Forgetting snapshots failed.")
-    end
-  end
-end
-
-def prune(config)
-  puts 'Pruning restic repo …'
-  prune_command = [config['restic-path'], 'prune']
-  puts("Command: #{prune_command.join(' ')}")
-  system(*prune_command)
-  if $?.exitstatus > 0
-    error(1, 'Failed to prune.')
-  end
-
-  check
-end
-
-def run_restic(config)
-  puts 'Executing restic with the following arguments …'
-  puts "ARGV: #{ARGV}"
-  exec(config['restic-path'], *ARGV)
-end
-
-def act(config, options)
-  puts "Applying configuration ‘#{config['name']}’ …"
-  set_restic_vars(config)
-  set_restic_path(config)
-  if options[:prune]
-    prune config
-  elsif options[:run_restic]
-    run_restic config
-  else
-    backup config
-  end
-  unset_restic_vars
-end
-
 unset_restic_vars
 
 options = {}
@@ -172,6 +80,78 @@ if !Pathname.new(config_file).exist? then
   error(1, "Config file #{config_file} has not been found!")
 end
 
+def check
+  puts 'Checking restic repo …'
+  check_command = ['restic', 'check']
+  puts("Command: #{check_command.join(' ')}")
+  system(*check_command)
+  if $?.exitstatus > 0
+    error(1, "Checking restic repository #{ENV['RESTIC_REPOSITORY']} failed.")
+  end
+end
+
+def backup(config)
+  puts "Backing up with restic …"
+  # https://restic.readthedocs.io/en/latest/040_backup.html#including-and-excluding-files
+  exclude = config.dig('backup', 'exclude')&.flat_map{|e| ['--exclude', e]} || []
+  paths = config.dig('backup', 'paths') || []
+  backup_command = ['restic', 'backup', *exclude, *paths]
+  puts("Command: #{backup_command.join(' ')}")
+  system(*backup_command)
+  if $?.exitstatus > 0
+    error(1, 'Failed to do backup.')
+  end
+
+  check
+
+  if config.dig('forget', 'enable')
+    puts 'Forgetting unnecessary snapshots …'
+    flags = config['forget'].select{|k,v| k != 'enable'}
+    flags = flags.flat_map{|k,v| ['--' + k, v.to_s]}
+    forget_command = ['restic', 'forget'] + flags
+    puts("Command: #{forget_command.join(' ')}")
+    system(*forget_command)
+    # Data will only be deleted when `restic prune` is executed or when
+    # `restic forget` is called with `--prune`.
+    if $?.exitstatus > 0
+      error(1, "Forgetting snapshots failed.")
+    end
+  end
+
+  unset_restic_vars
+end
+
+def prune(config)
+  puts 'Pruning restic repo …'
+  prune_command = ['restic', 'prune']
+  puts("Command: #{prune_command.join(' ')}")
+  system(*prune_command)
+  if $?.exitstatus > 0
+    error(1, 'Failed to prune.')
+  end
+
+  check
+end
+
+def run_restic(config)
+  puts 'Executing restic with the following arguments …'
+  puts "ARGV: #{ARGV}"
+  exec('restic', *ARGV)
+end
+
+def act(config, options)
+  puts "Applying configuration ‘#{config['name']}’ …"
+  set_restic_vars(config)
+  if options[:prune]
+    prune config
+  elsif options[:run_restic]
+    run_restic config
+  else
+    backup config
+  end
+  unset_restic_vars
+end
+
 puts "Using config file #{config_file} …"
 configs = YAML.load_stream(File.open(config_file))
 config_names = options[:config_names]