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Select the age or number of backup types that you wish to keep
| Option | Description |
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| Full | When deleting Full backups all linked incremental and Differential backups in the same backup chain (set) are also deleted This operation will delete the entire backup set. |
| Differential | When deleting Differential backups all linked incremental backups in the same backup chain (set) are also deleted. |
| Incremental | When deleting Incremental backups the integrity of the backup set is maintained by ensuring that the chain is never broken. This is achieved by merging older Incremental backups when required. In the example below, before retention, there is 1 Full backup, 1 Differential backup and 6 Incremental backups. The retention rules are set to retain 4 incremental backups. After retention, the most recent 4 incremental backups are retained. Deleting the oldest 2 incrementals would cause the backup chain to be invalid as the oldest retained incremental requires the previous 2 incremental backups to complete the chain. To ensure backup integrity the 2 older incremental backups are consolidated with it to create a new incremental backup.
F = Full
D = Differential
I = Incremental
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| Create a Synthetic Full if possible | When purging Incremental backups, if the backup set only contains a Full backup followed by Incremental backups, then this option causes the Full backup to be 'rolled forward' to create a Synthetic Full backup. This is also known as Incremental Forever. |
| Run the purge before the backup | Select this option to run the retention rules before the current backup. | Info |
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| Note: in Macrium Reflect v5 the current backup set wasn't included in the purge calculation when purging before the current backup. In v6 the current backup set IS included. This means that if you set the retention count to 1 Full backup then all of your backups will be deleted and a new Full backup created. |
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| Delete oldest backup set(s) if less than n GB | Automatically remove the oldest backup set(s) in the target folder if the free space on the drive drops below the GB threshold. | Info |
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| Note: The free space threshold is actioned dynamically. If the free space available drops below the threshold then the running backup is temporarily paused while older backup sets are purged. |
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