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When backing up to a hard disk or a network share:
A single backup file will be created if the destination disk's file system allows the estimated file
size.
The backup will automatically be split into several files if the destination disk's file system does
not allow the estimated file size. This might be the case when the backup is placed on FAT16 and
FAT32 file systems that have a 4-GB file size limit.
If the destination disk runs out of free space while creating the backup, the task enters the Need
interaction state. You have the ability to free additional space and retry the operation. If you do
so, the resulting backup will be split into the parts created before and after the retry.
When backing up to removable media (CD, DVD, Blu-Ray Discs, an RDX or USB drive used in the
removable device (p. 149) mode):
The task will enter the Need interaction state and ask for a new media when the previous one is
full.
When backing up to an FTP server:
The backup will automatically be split into files no more than 2 GB in size. Splitting is needed to
allow data recovery directly from the FTP server.
When backing up to an SFTP server:
A single backup file will be created. If the destination storage runs out of free space while
creating the backup, the task will fail.
When you replicate or move a backup (p. 70) to other locations, these rules apply to each location
independently.
Example.
Suppose that the primary location for a 3-GB backup is a hard disk, the second location is an FTP
server, and the third location is a network share. In this case, the backup will be stored as a single file
in the primary location, as two files in the second location, and as a single file again in the third
location.
Fixed size
Enter the desired file size or select it from the drop-down list. The backup will then be split into
multiple files of the specified size. This comes in handy when creating a backup that you plan to burn
to multiple CDs or DVDs later on. You might also want to split a backup into 2-GB files if you are
backing up to a hard disk, but you plan to manually copy the backup to an FTP server later.
4.7.6 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.
To specify the compression level
Select one of the following:
