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How can I make automatic snapshots with s3ql? I want to have a similar behaviour as in duplicity: Pushing the backup to the server creates a new incremental snapshot with the current timestamp. Then I want to be able to browse and restore a specific backup version for example the snapshot of a given date.

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1 Answer 1

Take a look at the official documentation.

Excerpt from that doc

Note that:

After the replication, both source and target directory will still be completely ordinary directories. You can regard as a snapshot of or vice versa. However, the most common usage of s3qlcp is to regularly duplicate the same source directory, say documents, to different target directories. For a e.g. monthly replication, the target directories would typically be named something like documents_January for the replication in January, documents_February for the replication in February etc. In this case it is clear that the target directories should be regarded as snapshots of the source directory.

Exactly the same effect could be achieved by an ordinary copy program like cp -a. However, this procedure would be orders of magnitude slower, because cp would have to read every file completely (so that S3QL had to fetch all the data over the network from the backend) before writing them into the destination folder.

Another excerpt

Snapshotting vs Hardlinking

Snapshot support in S3QL is inspired by the hardlinking feature that is offered by programs like rsync or storeBackup. These programs can create a hardlink instead of copying a file if an identical file already exists in the backup. However, using hardlinks has two large disadvantages:

backups and restores always have to be made with a special program that takes care of the hardlinking. The backup must not be touched by any other programs (they may make changes that inadvertently affect other hardlinked files) special care needs to be taken to handle files which are already hardlinked (the restore program needs to know that the hardlink was not just introduced by the backup program to safe space)

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