This shows a client with five files, two have been modified, one is unmodified, one is a
new document file that the client has just created and the last is a newly loaded file that
is a copy of one which already exists on the network, for example a newly installed
common application.
The backup excludes file 3, since it is unchanged. It also excludes file 5, since it is
identical to a file already on the AutoBackup appliance. For this file, the backup
directory index is updated to reflect the presence of this new file, but there is no need
to copy it to the appliance across the network. The backup writes all of file 4 to the
appliance, identifies the file blocks in files 1 and 2 that have changed, constructs a list
of these and sends them to the appliance for storage. (These block level differences are
known as Deltas.)
Retention Limit
HP SureStore AutoBackup is not an archive device. Once backed up, data will not be
kept indefinitely. It is vital that users understand this and continue to use other
processes for long-term archiving of valuable data.
Data is retained for a specified time. The default value is one month for versions and
two months for files that have been deleted from the client. This means that if files are
still live, the database ensures all versions are retained to ensure it can rebuild the file
for any date in the previous month, but discards all others. If the client has deleted the
file from the hard disk, it will still be retained on the appliance for the following two
Capacity, How To Manage
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