#Arrsync incremental vs whole file reddit how to#
$ – requires given linux-commands to be executed as a regular non-privileged userįull vs Incremental vs Differential backupsīefore we see how to use tar to create incremental and differential backups, it is important to understand the difference between these types of backup.įirst of all, we have to say that both incremental and differential backups are ultimately based on full or “level 0” backups: a full backup is a backup which, in a form of another, contains all the content of a specific filesystem in a determinate point in time. Creating full backups potentially requires a lot of time and space on disk: this obviously depends on the size of the data source. As a solution to these downsides, incremental and differential backup strategies can be implemented. Incremental and differential backups are similar in the sense that, as we already said, they both are ultimately based on full backups.Īfter an initial full backup is created, subsequent ones, incremental or differential, will include only filesystem changes. What does change between the two is what they consider as a base to compute filesystem differences. Example of an incremental backup strategy An incremental backup is always dependent and based on the backup which immediately precedes it, either full or incremental itself a differential backup, instead, uses always the initial full backup as a base. Suppose we want to create weekly backups of an hypothetical source directory implementing an incremental backup strategy. As a first thing, on Monday, we would create a full backup of the source directory. The next day, Tuesday, we would create a new backup, which would contain only files and directories which were created or modified in the source directory since the full backup occurred. The new backup will also keep track of files which were deleted ever since it is what is called a “level 1” backup. On Wednesday we would create a third backup, which, in turn, will “keep track” of all the differences which occurred since the backup we performed on Tuesday. This backup will therefore be dependent on the previous one directly, and indirectly on the first backup. We would keep on repeating the pattern for the rest of the week.
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