Chapter 12 Section 8 Backup and Restore
Offsite Storage
A location where files are stored that is away from the physical office space where the data is created. Offsite storage is part of 3-2-1 rule.
SAN
A network of fast storage appliances. Stores file shares and other data that needs to be accessed quickly.
What 2 describes a system image backup
A system image contains everything on the system volume, including the operating system, installed programs, drivers, and user data files A system image backup consists of an entire volume backed up to .vhd files
Scalability
Ability to increase or decrease data storage space
Snapshot
An instant copy of an individual computer. are normally used on virtual machines (VMs) when changes may need to be reverted.
Your disaster recovery plan calls for backup media to be stored at a different location. The location is a safe deposit box at the local bank. Because of this, the disaster recovery plan specifies that you choose a method that uses the least amount of backup media, but also allows you to quickly back up and restore files. Which backup strategy would BEST meet the disaster recovery plan?
Perform a full backup once per week and a differential backup the other days of the week
Your network uses the following backup strategy: Full backups every Sunday night Differential backups Monday night through Saturday night On Thursday morning, the storage system fails. How many restore operations would you need to perform to recover all of the data?
2; need to restore -the full backup from Sunday -the differential backup from Wednesday
Your network uses the following backup strategy: Full backups every Sunday night Incremental backups Monday night through Saturday night On a Thursday morning, the storage system fails. How many restore operations would you need to perform to recover all of the data?
4; Restore the full backup from Sunday Restore the incremental backup from Monday Restore the incremental backup from Tuesday Restore the incremental backup from Wednesday
Full backup
A back up that captures all of the data on a machine. is always the first backup you should run.
Differential Backup
A backup that includes only the files that have changed since the last full backup.
Incremental backup process
Backs up all files with the archive bit set and resets the archive bit After backing up the file, the archive bit is reset. The primary attraction to this backup plan is that it requires less storage space and processing time to complete. Restoration starts from the last full backup and then requires the loading of each subsequent incremental backup for a full restoration.
Incremental backup
Backup that contains all changes since the last incremental backup
Archive bit set are
Files that have been modified
NAS
Network storage appliance
NAS
Often used to store backups or other files
Online vs offline storage operation
Online refers to storage that is accessible through your private, internal network. This means that if you need to access your backups quickly it can be done from any location that has access to the network. Offline is the opposite; the backups are inaccessible through the network. —-This means that an IT admin must attach the backup to the network before it can be accessed. This is done for security and redundancy issues. —-If your network is compromised, offline backup storage will not be affected. This means your data is safe from integrity compromise. Both techniques should be used for redundancy and security.
What is backed up during an incremental backup
Only files that changed since the last full or incremental backup
Restoration order
Pre-planned order in which servers will be restored following a disastrous event. The order is determined by the server's importance to the company's operation
A system failure has occurred. Which of the following restoration processes would result in the fastest restoration of all data to its most current state?
Restore the full backup and the last differential backup -fastest method
What is risk tolerance also known as
Risk appetite
What is the 3-2-1 rule
Specifies there should b three copies of every backup Two copies are kept on premise on separate storage devices And One copy is stored offsite
Why should backup media be stored offsite
To prevent the same disaster from affecting both the network and the backup media
A differential backup backs up
all files with the archive bit set, but it does not reset the archive bit.
A copy backup backs up
all files without resetting the archive bit.
NAS (Network Attached Storage)
an appliance used to store data in file structures, such as NTFS. also uses file share protocols like SMB. The appliance allows multiple users to access data simultaneously. This storage option is relatively inexpensive and is easy to use for backup copies.
SAN (storage area network)
another appliance storage option. This option is normally found in larger companies because of cost. uses Fibre Channel protocols that make accessing the backup data much faster. It stores data at the block level. The appliance connects to the network via fibre cable. It also can manage several SAN appliances at one time, making it like a mini-network.
What is the process of a full backup
backs up all files regardless of the archive bit and resets the archive bit.
cloud storage option
relatively new. uses the physical resources of another company as a storage device for the backup. The backups are transferred over the internet and stored on remote servers. When the backup data is needed, it is downloaded from the cloud provider. This option can be easy to use but is expensive since cloud providers charge by the amount of data uploaded and downloaded.
Offsite storage
storage is an integral part of business continuity plans and disaster recovery plans. This concept means that a copy of your backups are stored away from your office. The backups could be in a safe, safe deposit box at a bank, or even in the cloud. You must determine your risk tolerance, also referred to as risk appetite.
