Microsoft Office Tutorials and References
In Depth Information
You want your backups to run during the quietest times with regards to network
usage and this is typically not during business hours if possible. But if your data
takes a really long time to back up it may overlap and end up running during
business hours. If your backup has to run during business hours this could impact
network performance. One way around this is to utilize a second network that only
your backups run on. This is typically seen in larger environments that contain larger
amounts of data. The end result should be fast backups and fast restores. When
backups are fast and efficient, there is generally less of an impact on the server being
protected which keeps both administrators and users of that server happy.
One of the ways to determine your backup schedule is to calculate the frequency
with which your important data changes. DPM can back up as often as every 15
minutes although you may not want to back up all your data this often. Some data
may only change once per day or once every couple of days and you could then
back that data up as often as it changes. Typical data types that change frequently
throughout a business day are file shares, Exchange (e-mail), financial data, and
databases. Be sure to schedule your backups when network usage is at its lowest.
As covered previously, you could negatively impact network performance if
these backups are scheduled during working business hours. Your media will
often be a factor in determining your backup schedule. If you use a disk-based
backup and you have a lot of storage space you can run backups more often. DPM
improves upon bandwidth usage by using the VSS function and takes snapshots
of the data. The installed DPM agent wont process the actual data, instead it will
process the snapshot data. Because of this it is more viable to make a back up of a
production environment during production hours. Even with the bandwidth usage
improvements in DPM you still want to be cautious of the network usage that your
backup uses depending on your specific workloads.
Local and offsite backup
Now let's talk about local and offsite backups. There are two kinds of backups. One
is a local backup that stays within your physical building and the other is an offsite
backup that is away from your psychical building. Not all companies will have
the resources for offsite backups but it is strongly recommended to have an offsite
backup in case a disaster happens to your office destroying your onsite backups.
Local backups can be on disk or tape and are stored locally. Offsite backups are disks
that have been taken offsite, tapes that have been moved offsite, or moving data to
offsite storage using a data transfer mechanism.