Data Deduplication
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With data deduplication, you can save a significant amount of cloud storage space and reduce operational costs. Cloudback offers a simple but efficient technique of data deduplication.
Our backup archives are deterministic. If nothing has changed in a GitHub repository, we create the same archive before encrypting it. Once the archive is encrypted, the AES encryption makes it non-deterministic.
Cloudback compares the checksum of a new deterministic backup with a previous deterministic backup before encrypting it. If the archives match, Cloudback doesn’t upload a new archive to storage, but instead stores a link to the previous archive. The retention policy is extended for the previous archive, it’s not deleted until there are valid linked backups.
The feature is released on 06 May 2022, please note that:
Deduplication is disabled by default for all customer managed storages created before 06 May 2022; you must enable it manually if you want to use this feature.
Deduplication is enabled by default for all customer managed storages created after 06 May 2022; you must manually disable it if you don’t want to use this feature.
Data deduplication is a customer managed storage setting and it’s configured separately for each storage. To change the deduplication setting for a storage, use the Deduplication Type combo box in the New Storage and Edit Storage:
The following deduplication types are available:
Only archive if changes have occurred - no duplicates: Cloudback will not store a new archive if the checksum of a new backup matches the checksum of a previous backup. This is the default deduplication type.
Always archive - duplicates allowed: Cloudback will always store a new archive even if the checksum of a new backup matches the checksum of a previous backup.
Deduplication occurs when certain conditions are met:
Deduplication is enabled for the storage while creating a storage or by editing an existing storage
The previous backup of a repository is stored in the same cloud storage
The checksum of a previous backup matches the checksum of a new backup
The deduplication status of a backup is displayed in the Backup details window as the Deduplicated field:
Yes means that the backup is deduplicated
No means that the backup is not deduplicated
You can open the Backup details window by clicking on the Information icon which is displayed in the list of backups in the Backups tab on the Repository details page, or by clicking on the Information icon which is displayed in the list of backups on the repository card in the Dashboard page.
The deduplication statistics are displayed in the Deduplication over period section of the Repository details page. The statistics are displayed for specific periods: Last Week, Last Month, Last 3 Months, Last 6 Months, and Last Year.
The following statistics are displayed for the selected period:
Backups processed - the total number of backups
Backups deduplicated - the number of backups that were deduplicated
Backups size - the total size of backups uploaded to storage
Space saved - the total size of saved space in storage
Statistics charts are displayed for the selected period:
Donut chart shows the number of deduplicated and non-deduplicated backups
Bar chart shows the amount of saved space in the storage.
the green bars represent the amount of saved space
the grey bars represent the amount of space used by non-deduplicated backups
