Restore Data - Image Level ProxyHost
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Overview
Restore Considerations for this
Agent
Restore Destinations
The following page describes the agent-specific restore options. Additional restore options are accessible from the Related Topics menu.
The Image Level ProxyHost iDataAgent
performs the following types of restore operations:
- File Level Restore - You can browse the files/folders in your backup and
select the files/folders you want to restore.
- Volume Level Restore - You can browse the volumes you have backed
up and select a volume to restore.
When restoring data, you can, if desired, restore the data to a file system type
that differs from the type in which it originated. For example, you can restore
NTFS data to a FAT file system and restore FAT data to an NTFS file system. FAT
file systems do not support Discretionary Access Control Lists (DACL); therefore,
any NTFS data that you restore to a FAT partition loses its original access privileges.
Conversely, when FAT file system data is restored to an NTFS file system, the restored
data inherits the DACL of the destination directory.
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Before performing any restore procedures for this agent, review and verify the
following information.
General
- Review the general restore requirements described in
What You Need to Know Before Performing a Restore.
- When restoring Image Level ProxyHost data, you can, if desired, restore
the data to a file system type that differs from the type in which it originated.
For example, you can restore NTFS data to a FAT file system and restore FAT
data to an NTFS file system. FAT file systems do not support Discretionary Access
Control Lists (DACL); therefore, any NTFS data that you restore to a FAT partition
loses its original access privileges. Conversely, when FAT file system data
is restored to an NTFS file system, the restored data inherits the DACL of the
destination directory.
- It is recommended that you restore data to the same type of operating system
from which it was backed up.
- It is important to note that when performing a restore, the Job Controller
will show the source machine even though the destination machine may be different.
-
You should configure the next backup after an in-place restore to be a full backup,
so as to take advantage of data block copy. Even if only some of the volumes of
a subclient were restored, all the volumes in the subclient should be backed up
as full. The software does not enforce this, but it is recommended.
- Supported only for certain operating systems and file system types; see
Supported Data Types.
- The Image Level and Image Level ProxyHost iDataAgents
on Unix can
perform a File Level Restore
only when the OS of the Client computer and the MediaAgent are the same.
- For a Windows MediaAgent, the Index Cache folder must reside on an NTFS
partition.
- If metadata was not collected during a backup, a File Level restore cannot
be performed. This might result from having selected the
Skip
Metafile Creation option in the Advanced Backup Options screen, or as a
result of failure to collect metadata during the backup, in which case the system
generated an Event Message warning of the failure.
- Do not restore:
- hidden objects
- system files
- recycler files
- Image Browse is not supported. A no-image browse operation returns the most
recent version of the data that existed back to the most recent full backup,
rather than returning an image of the specified entity (i.e., file system/directory).
To perform a File Level Restore of an entity to a point in time, you will need
to Browse back in time, to the point
in time you want to restore.
- When a File Level restore is started, metadata is restored prior to the
actual restore of files, and during this time, a message might indicate the
Index Cache is being restored, although it already exists. Also, the media containing
this metadata will be mounted into the library even if this media does not contain
the data from the full backup.
-
An Out-of-Place File Level Restore to a non-existing path may be reported as
successful, even though no files were restored.
- For a Volume Level Restore, you must select the Browse only Volumes
option in the Browse Options dialog box, or the restore operation will
be a File Level Restore.
- Do not run Volume Level restore if destination volume contains OS files.
- When performing a Volume Level Restore, the destination volume will adopt
the file system type of the restored data. Thus, for instance, if you restore
an NTFS volume to a FAT destination volume, the destination volume will be NTFS
as a result of the Volume Level Restore.
- When restoring a volume changes its file system type (see
Supported
Data Types), sometimes Windows Explorer may still show the volume having
the same file system type as before the restore, even though Computer Management
shows the new (correct) type. After a reboot, Windows Explorer will show the
correct file system type.
- The destination volume must be at least as large as the volume from which
the data was backed up. This is true regardless of the amount of data that is
actually restored. For example, if you back up a 10 GB volume that contains
100 MB of data, you can only restore that data to a volume that is 10 GB or
larger. The restore operation will fail if the destination volume is smaller
than the source volume. We recommend that you restore data to a volume that
is at least 1 MB larger than the source volume.
Windows Logical Disk Manager
(LDM) displays the size of a volume in round numbers. Consequently, LDM may
display the same size for two volumes with slightly different block counts.
To get the exact size of a volume, open the Windows Explorer, right-click the
volume, and select Properties. The volume's capacity in bytes is its
exact size.
If no destination volume is specified, the system attempts to restore to
a volume on the Destination Computer with the same name as the one being
restored. If no such volume exists, the restore operation fails.
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By default, the Image Level ProxyHost iDataAgent
restores a volume or file(s) to the primary host from which it originated (not the
backup host); this is referred to as an in-place restore. If desired, you can also
restore the data to a different Image Level ProxyHost client. Keep in mind the following
considerations when performing such restores:
- The destination client must reside in the same CommCell as the client whose
data was backed up.
- Each of these restore destination types are available for both Volume Level
restores as well as File Level restores, both for Windows and Unix.
The following section enumerates the types of restore destinations that are supported
by the Image Level ProxyHost iDataAgent.
See Restore/Recover/Retrieve Destinations - Support for a list of Agents supporting each restore destination
type.
For File Level Restores only, besides restoring data to a client computer's local
drive, you can also restore data to a UNC path. (See
Restore to Network Drive/NFS-Mounted File System for comprehensive information.)
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