Bedienungsanleitung Acronis Backup Advanced Version 11.5 Update 6 (Seite 237 von 449) (Englisch)

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Disk-level backup

Deduplication of disk blocks is not performed if the volume's allocation unit size—also known as

cluster size or block size—is not divisible by 4 KB.

Tip: The allocation unit size on most NTFS and ext3 volumes is 4 KB. This allows for block-level deduplication.

Other examples of allocation unit sizes allowing for block-level deduplication include 8 KB, 16 KB, and 64 KB.

File-level backup

Deduplication of a file is not performed if the file is encrypted and the In archives, store encrypted

files in decrypted state check box in the backup options is cleared (it is cleared by default).

Deduplication and NTFS data streams

In the NTFS file system, a file may have one or more additional sets of data associated with it—often

called alternate data streams.

When such file is backed up, so are all its alternate data streams. However, these streams are never

deduplicated—even when the file itself is.

7.5.7.6 How to migrate to Update 6 deduplication

What’s new in Update 6 deduplication

Starting with Update 6, Acronis Backup Storage Node has a new indexing algorithm for server-side

deduplication and a new format of the deduplication database. As a result, the following

improvements are achieved:

 Less RAM is required per terabyte of unique data: 3 GB instead of 16 GB.

 Performance degradation does not occur as the amount of stored unique data grows.

For example, the minimum of 8 GB RAM enables you to back up and recover (at a disk level) 2.6 TB of

unique data, without any performance degradation. For file-level backups, the limit is more than 12

TB. When the data reaches this size, the indexing activity fails. The error message contains a

recommendation to increase the RAM. However, the backups continue to run. If you add more RAM

to the storage node, the indexing will run again after the next backup.

New configuration parameters (p. 230) enable you to choose between the old and new indexing

algorithms and control the storage node memory allocation.

How to recreate a deduplication database

The new indexing algorithm requires the new deduplication database format. To apply this algorithm

to an old vault, you must recreate the vault’s deduplication database.

Exporting data to a newly created vault is not recommended because it requires additional time to

“assemble” the deduplicated data and additional space to temporarily store this data. Redirecting

backups from an old vault to a new vault results in a full backup of the data and a worse

deduplication ratio because the data is not deduplicated between the two vaults.

There are two methods of recreating the deduplication database:

 Re-attaching the managed vault

If the vault is encrypted, you must provide the encryption password when re-attaching the vault.

 Changing the deduplication database path

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