Acronis Backup & Recovery 10 Adv WS TIDLBPDES Manuale Utente
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TIDLBPDES
Microsoft Volume Shadow Copy Service (VSS) provides an infrastructure for backing up data on
running systems by ensuring coordination between applications updating the data on the disks and
backup applications. Examples of VSS-aware database servers are Microsoft Exchange and Microsoft
SQL Server.
running systems by ensuring coordination between applications updating the data on the disks and
backup applications. Examples of VSS-aware database servers are Microsoft Exchange and Microsoft
SQL Server.
Enable the Volume Shadow Copy Service option if any of your databases or applications are
compatible with VSS. The VSS will notify the VSS-aware applications that the backup is about to start.
This ensures the consistent state of all data used by the applications, in particular, completion of all
database transactions, at the moment of taking the data snapshot by Acronis Backup & Recovery 10.
The data consistency, in turn, ensures that the application will be recovered in the correct state and
become operational immediately after recovery.
compatible with VSS. The VSS will notify the VSS-aware applications that the backup is about to start.
This ensures the consistent state of all data used by the applications, in particular, completion of all
database transactions, at the moment of taking the data snapshot by Acronis Backup & Recovery 10.
The data consistency, in turn, ensures that the application will be recovered in the correct state and
become operational immediately after recovery.
Snapshots provided by VSS are not used.
If your database is incompatible with VSS, use Pre/Post data capture commands (p. 94) to indicate
which commands should be performed before and after taking the snapshot, to ensure that the data
is being backed up in a consistent state. For instance, specify pre-data capture commands that will
suspend the database and flush all caches to ensure that all transactions are completed; and specify
post-data capture commands that will resume the database operations after the snapshot is taken.
which commands should be performed before and after taking the snapshot, to ensure that the data
is being backed up in a consistent state. For instance, specify pre-data capture commands that will
suspend the database and flush all caches to ensure that all transactions are completed; and specify
post-data capture commands that will resume the database operations after the snapshot is taken.
Volume shadow copy writers
Before backing up the data of VSS-aware applications, make sure that the volume shadow copy
writers for those applications are turned on, by examining the list of writers that are present in the
operating system. To view this list, run the following command:
writers for those applications are turned on, by examining the list of writers that are present in the
operating system. To view this list, run the following command:
vssadmin list writers
Note: In Microsoft Windows Small Business Server 2003, the writer for Microsoft Exchange Server 2003 is turned
off by default. For instructions on how to turn it on, see the corresponding Microsoft Help and Support article
http://support.microsoft.com/kb/838183/en.
off by default. For instructions on how to turn it on, see the corresponding Microsoft Help and Support article
http://support.microsoft.com/kb/838183/en.
3.4.1.8.
Compression level
This option is effective for Windows and Linux operating systems and bootable media.
The option defines the level of compression applied to the data being backed up.
The preset is: Normal.
The optimal data compression level depends on the type of data being backed up. For example, even
maximum compression will not significantly reduce the archive size if the archive contains essentially
compressed files, such as .jpg, .pdf or .mp3. However, formats such as .doc or .xls will be compressed
well.
maximum compression will not significantly reduce the archive size if the archive contains essentially
compressed files, such as .jpg, .pdf or .mp3. However, formats such as .doc or .xls will be compressed
well.
To specify the compression level
Select one of the following:
•
None – the data will be copied as is, without any compression. The resulting backup size will be
maximal.
maximal.
•
Normal – recommended in most cases.
•
High – the resulting backup size will typically be less than for the Normal level.
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