Adds write-only support for increased security. Skips faux 'lost+found' db that breaks script.

settings-sample.rb

@@ -17,6 +17,15 @@
 # use SSL to transmit backups to S3 (a good idea)
 USE_SSL = true
 
+# LIMIT PRIVILEGES
+#  * Limits actions to only write new backups and create new buckets. No attempts are made to
+#    delete data from S3. Set this to true when the credentials you provide don't have the
+#    rights to perform deletions. This is a handy way to prevent disaster should someone
+#    malicious gain access to them. With correctly restricted IAM permissions they won't be
+#    able to delete existing backups. Use a separate server and credentials to purge old backups.
+#    (default is false)
+SKIP_DELETE = false
+
 # CREATE AWS/S3 CONNECTION
 AWS::S3::Base.establish_connection!(
   :access_key_id  => '*** YOUR CREDENTIALS HERE ***',

simple-s3-backup.rb

@@ -36,6 +36,7 @@
     connection = Sequel.mysql nil, :user => MYSQL_USER, :password => MYSQL_PASS, :host => 'localhost', :encoding => 'utf8'
     @databases = connection['show databases;'].collect { |db| db[:Database] }
     @databases.delete("performance_schema") # Remove this db from the list, since it makes no sense to back up and causes some errors with --events.
+    @databases.delete("#mysql50#lost+found") # Skip this db since backup would fail. Not a real db but artifact of putting the MySQL datadir on own volume with ext3/4 fs.
   elsif defined?(MYSQL_DBS)
     @databases = MYSQL_DBS
   end
@@ -108,8 +109,10 @@
 # Remove tmp directory
 FileUtils.remove_dir full_tmp_path
 
-# Now, clean up unwanted archives
-cutoff_date = Time.now.utc.to_i - (DAYS_OF_ARCHIVES * 86400)
-bucket.objects.select{ |o| o.last_modified.to_i < cutoff_date }.each do |f|
-  S3Object.delete(f.key, S3_BUCKET)
-end
+# Now, clean up unwanted archives, if allowed
+unless SKIP_DELETE
+  cutoff_date = Time.now.utc.to_i - (DAYS_OF_ARCHIVES * 86400)
+  bucket.objects.select{ |o| o.last_modified.to_i < cutoff_date }.each do |f|
+    S3Object.delete(f.key, S3_BUCKET)
+  end
+end