Full backup Full backup is process of backing up ALL data. First step towards all other types of backup Backup time will be longer Restore operation takes less time Differential backup Differential backup is the process of backing up data that has changed since the last FULL backup. Requires file maintenance as the backup file will be of similar size or larger than its previous backup Longer backup time than incremental backup Faster restoration than incremental backup Incremental backup Incremental backup is the process of backing up data that has changed since the last Full, Incremental or Differential backup Takes lesser backup time as it will have small data to archive Takes longer restoration time Mirror backup Mirror backup is similar to full backup and is a direct copy of the files/folders Files are not compressed in zip files and are not protected with password. They remain the mirror or exact copy of the source.

InfraRecorder - available under GPL license and can be used to convert MP3 music to audio (cda) format in Microsoft Windows. To convert mp3 to audio (cda) format, all you need to do is to select InfraRecorder » choose Audio Disc » drag the MP3 file to file list » Click Burn the current compilation to disc Using InfraRecorder, you can also compile a CD/DVD, record disc images (ISO, BIN, CUE), record dual layer DVD's, fixate discs and many such features. You can check InfraRecorder at http://infrarecorder.org

When moving mysql database from one server to another or, to test that the data backup works as expected we need to import mysql dump file in the testing environment. Create the database (test-database) in the testing environment and identify the location of the .gz or .sql file. If the mysql dump was a .gz file, you need to gunzip to uncompress the file by typing $ gunzip mysqldump.sql.gz This will uncompress the .gz file and will just store mysqldump.sql in the same location. (more…)

Tar (tape archive) does not compress files. They are used for grouping all files in a folder so that it can be transferred across locations. In order to compress the files, you need to use zip, gzip or bzip2 utilities. gzip, bzip2 are file compression utilities and gunzip, bunzip2 are file uncompression utilities. bzip2 compresses files to a smaller size compared to gzip, but it takes longer to compress the files. Bzip2 uses Burrows-Wheeler block sorting text compression algorithm (with Huffman coding) and gzip uses Lempel-Ziv coding. so, a file compressed with one utility cannot be uncompressed with the other utility. (more…)

Location where the Apache error log entries can be found in Ubuntu user@server:~# less /var/log/apache2/error.log

SSL Error: Revocation information for the security certificate for this site is not available. Do you want to proceed? Solutions: i) Install the root CA under Trusted Certificate Authority or, ii) Add an exception to the browser filter not to check certificate revocation or, iii) Programatically handle the SSL stream when request is made from the server