Symantec GHOST 14, Manual

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On Wednesday morning, you bring drive B to the office. You plug in drive B and
Norton Ghost detects that drive B is an Offsite Copy destination. Norton Ghost
then automatically begins copying Monday night's base recovery point and Tuesday
night's incremental recovery point. At the end of the day Wednesday, you take
drive B home and place it in a safe place with drive A.
You now have multiple copies of recovery points stored at two separate, physical
locations: your original recovery points stored on your backup destinations at the
office, and copies of those same recovery points stored on your Offsite Copy
destination drives. Your Offsite Copy destination drives are stored in a safe place
at your home.
The next morning, Thursday, you take drive A to the office and plug it in. Tuesday
and Wednesday night's recovery points are then automatically copied to drive A.
Note: Consider using the external drive naming feature that lets you provide a
unique name, or alias, to each drive. Then place matching physical labels on each
external drive to help you manage the task of swapping the drives.
See “Using aliases for external drives” on page 41.
Each time you plug in either drive A or B, the latest recovery points are added to
the drive. This method gives you multiple points in time for recovering your
computer in the event that the original backup destination drives fail or become
unrecoverable.
Using external drives as your Offsite Copy destination ensures that you have a
copy of your backup data stored at two separate, physical locations.
Using a network server as your Offsite Copy destination
You can also specify a local area network server as an Offsite Copy destination.
You must be able to access the server that you plan to use. You must either map
a local drive to the server, or provide a valid UNC path.
For example, suppose that you set up a local external drive as your first Offsite
Copy destination. Then you identify a server that is located at a second physical
location from your own office. You add the remote server as a second Offsite Copy
destination. As backups occur, recovery points are copied first to the external
hard drive, and then to the remote server.
If the remote server becomes unavailable for a period of time, Offsite Copy copies
all recovery points created since the last connection. If there is no room to hold
all of the recovery points available, Offsite Copy removes the oldest recovery
points from the FTP server, making room for the newest recovery points.
75 Backing up entire drives
How Offsite Copy works