MODULE 5

• Data Recovery - The process of trying to restore data after an unexpected event that results in data loss or corruption.
• When an unexpected event occurs, your main objective is to resume normal operations as soon as possible, while minimizing the disruption to your business functions. TRUE
• Data Recovery - When an unexpected event occurs, your main objective is to resume normal operations as soon as possible, while minimizing the disruption to your business functions.
• Backing up data is free. FALSE
• Every additional file you back up takes up little more disc space, increasing the overall costs of your backup solution. TRUE
• Make sure that you account for future growth and choose a solution as flexible enough to easily accommodate increases in data backups.
• Data can be backed up either locally to systems on site, or the

  backup data can be sent upside to remote systems.
• The advantage of onsite backup solutions is that the data is

  physically very close. But one of the unexpected event is a building

  fire.
• This involves making backups of critical data and sending the

  backup data offsite to remote systems in a different physical

  location. This could be another backup server that you control in a

  different office, or a cloud hosted backup service.
• Implementing both on site and offsite backups is recommended if it's within your organization's budget. TRUE
• Backup Solutions - implementing both on site and offsite backups is

  recommended if it's within your organization's budget backup time period.
• Under backup solutions, how long do you need to hang on to backups for archive older data using a slower but cheaper storage mechanism – Data Tapes
• Tape storage is pretty cheap, but isn't as easy or quick to access as data stored on hard drives or solid-state drives.
• Tape storage - It is usually used for long term archival purposes.
• Rsync - command line utility
• Rsync isn't explicitly a backup tool, but it's very commonly used as one.
• Rsync - it's a file transfer utility that's designed to efficiently transfer and synchronize files between locations or computers.
• Rsync - supports compression and you can use SSH
• Rsync - Using SSH, it can also synchronize files between remote machines making it super useful for simple automated backups.
• Time Machine - Apple’s first party backup solution available for Mac

  operating systems
• Time Machine - incremental backup model
• Time Machine - supports restoring an entire system from backup or

  individual files
• Time Machine - allows restoring older versions of backup files
• Backup and Restore - Microsoft’s file based version where files are backed up to a zip archive
• Backup and Restore - system image where the entire disk saved block by block to a file
• Backup and Restore - File based backup support, either complete backups or incremental ones.
• Backup and Restore - System image backups support differential mode, only backing up blocks on the disk that have changed since the last backup.
• Testing Backups - The takeaway here is that it isn't sufficient to just set

  up regular backups.
• Testing Backups - recovery process and that process needs to be tested regularly.
• Under testing backups, Restoration procedures should be documented and accessible so that anyone with the right access can restore operations when needed.
• Disaster Recovery testing - is critical to ensuring a well functioning recovery system.
• Full backup - Making a copy of the data to be fully backed up.
• Full backup - The full unmodified contents of all files to be backed up is included in this backup mechanism whether the data was modified or not
• Differential backup - Only backup files that are changed, or been created since the last full backup
• it's a bad practice to perform infrequent full backups, while also doing more frequent differential backups. - FALSE
• Regular incremental backups - Only the data that's changed in files is backed up, and more time consuming
• Regular incremental backups - only sorts differences in the files that have changed since the last incremental backup
• File Compression - it helps save space and when creating a backup all the files and folder structures will be copied and put into an archive.
• File Compression - Archives are useful for keeping files organized and preserving full structure.
• Besides archiving the files, backups can also be compressed, this is a

  mechanism of storing the same data while requiring less disk space by using complex algorithms.