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Improved explanation of retention options

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kuro68k 2022-10-06 10:23:26 +01:00
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docs/03-using-the-graphical-user-interface.md
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@ -188,12 +188,25 @@ An Upload Volume is an encrypted compressed file that contains a part of your ba
The retention can be set in 3 ways:
* **Unlimited:**
* **Keep all backups:**
Backups will never be deleted. This is the most safe option, but remote storage capacity will keep increasing.
* **Until they are older than:**
* **Delete backups that are older than:**
Backups older than a specified number of days, weeks, months or years will be deleted.
* **A specific number:**
* **Keep a specific number of backups:**
The specified number of backup versions will be kept, all older backups will be deleted.
* **Custom backup retention:**
Enter your own settings in the text box that appears.
* **Smart backup retention:**
retains one backup for each of the last 7 days, each of the last 4 weeks, and each of the last 12 months.
Consider the case of Smart Backup Retention. Using Duplicati notation it can be written as '1W:1D,4W:1W,12M:1M'. This results in this behaviour:
**Active files:** Files that exist in the source will continue to be included in at least one backup version. For example, a file that exists in the source but which is 3 years old will still be in at least one backup version, regardless of the rentention policy.
**Deleted files:** When a file is deleted from the source it will not be included in any new backups. Old backup versions will retain a copy of the deleted file for at least 12 months. After 12 months the last backup version to include it will eventually be removed.
**Modified files:** When a file's content changes, previous versions will follow the backup retention policy. In other words, there will be a maximum of one version per day for the last week, one version per week for the last 4 weeks, and one version per month for the last 12 months. A daily version that ages to over a week old will either be retained as that week's version, or deleted.
![](ss_newbackup_10.png)