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How frequently will shadow copies be made?
Identifying the volume
Shadow copies are taken for a complete volume, but not for a specific directory. Shadow copies
work best when the server stores user files, such as documents, spreadsheets, presentations, graphics,
or database files.
NOTE:
Shadow copies should not be used to provide access to previous versions of application or e-mail
databases.
Shadow copies are designed for volumes that store user data such as home directories and My
Documents folders that are redirected by using Group Policy or other shared folders in which users
store data.
Shadow copies work with compressed or encrypted files and retain whatever permissions were set
on the files when the shadow copies were taken. For example, if a user is denied permission to read
a file, that user would not be able to restore a previous version of the file, or be able to read the file
after it has been restored.
Although shadow copies are taken for an entire volume, users must use shared folders to access
shadow copies. Administrators on the local server must also specify the
\\servername\sharename
path to access shadow copies. If administrators or end users want to access a previous version of a
file that does not reside in a shared folder, the administrator must first share the folder.
NOTE:
Shadow copies are available only on NTFS, not FAT or FAT32 volumes.
Files or folders that are recorded by using Shadow Copy appear static, even though the original data
is changing.
Allocating disk space
When determining the amount of space to allocate for storing shadow copies, consider both the
number and size of files that are being copied, as well as the frequency of changes between copies.
For example, 100 files that only change monthly require less storage space than 10 files that change
daily. If the frequency of changes to each file is greater than the amount of space allocated to storing
shadow copies, no shadow copy is created.
Administrators should also consider user expectations of how many versions they will want to have
available. End users might expect only a single shadow copy to be available, or they might expect
three days or three weeks worth of shadow copies. The more shadow copies users expect, the more
storage space administrators must allocate for storing them.
Setting the limit too low also affects backup programs that use shadow copy technology because
these programs are also limited to using the amount of disk space specified by administrators.
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