1.2.1. Explanation of Backup

There are many configurations in each environment of customer. You have to decide your point of backup to protect your environment.
In here, we give you some information to understand regarding backup.
1. What do you want to backup? (Consideration of storage size)
Items Usage
Disk/Volume
(Image Backup)
  • You want to protect a whole server or system area.
  • There are many files and folders to protect in your server.
  • There are many servers to protect in your system.
File/Folder
(File Backup)
  • You want to protect particular files or folders only.
You need to consider retention period of backup archive file.

2. How do you want to backup? (Consideration of backup time)
Type Explanation Merit Demerit
Full
A full backup stores all data selected for backup.
A full backup underlies any archive and forms the base for incremental and differential backups.
Recovery time is short.
Possible to recover if any archives have broken.
Backup time is long.
Backup size is large.
Incremental
An incremental backup stores changes to the data against the latest backup.
You need access to other backups from the same archive to recover data from an incremental backup.
Backup time is shortest.
Backup size is smallest.
If one backup in the “chain” is corrupted, the next ones can no longer be used.
Differential
A differential backup stores changes to the data against the latest full backup.
You need access to the corresponding full backup to recover the data from a differential backup.
Backup time is short.
Backup size is small.
If you frequently change from latest full backup, backup size becomes large.

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