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What is the command to do a incremental backup? Any source or any links would be much appreciated.
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Before creating an incremental backup, we will create, update and delete files under the data directory, Next, we will run the following command to create an incremental backup which is called Level1 incremental backup where we could see the file which is newly added and whose content got changed alone backed up.
Use the incrbydate option with the incremental command to back up new and changed files with a modification date later than the last incremental backup stored at the server. See Incrbydate for more information about the incrbydate option.
An incremental backup scenario requires one full backup and then subsequent incrementals over a period of time. For example, if a full backup was performed on Monday, Tuesday's incremental will take a snapshot and back up all new or changed files since Monday's backup.
Level 0 are a base for subsequent backups. Copies all blocks containing data similar to a full backup, with the only difference that full backups are never included in an incremental strategy. Level 0 can be backup sets or image copies.
rsync is what you are looking for. Here is a nice tutorial.
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Depending on what you need from your backups, rdiff-backup may be what you want. It's based on the same idea as rsync, but also keeps historical backups (in a space-efficient manner, by storing the differences).
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