Ferris Analyzer Information Service. Report #798. October 2008.
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With an on-premise solution, the IT staff is in control. There are two
First, you can set priorities. For example:
" If a big lawsuit arrives, you can apply the appropriate resources to
respond to discovery requests in a timely way. Some SaaS
offerings can require interaction with SaaS staff to expedite the
request. If the SaaS employees are busy with another, bigger
customer s emergency, then yours might get deferred. (Note that
many SaaS solutions give full control to the business and allow it
to run its own e-discovery requests, which gives IT the same level
of data control as an on-premise solution.)
" If you need to migrate to another solution, the SaaS vendor may
not respond as quickly as you d like.
Second, you can organize processes and procedures the way you want
them to be organized. For example, you can define and implement
specific deletion policies. You can ensure that old tapes are destroyed,
deep erasures are performed on disk, and so on. With SaaS, deleted
data may no longer be visible to you, but it may still exist on the
service provider s system.
Companies archive large amounts of information. In some cases, they
must archive a large volume of data at one time, such as during initial
system startup or during periodic maintenance, where the entire
message store must be backed up. In that case, 1.5GB of email per
user must commonly be transferred to the store. This is not a problem
over LAN speeds, but it will normally take many days over most
organizations WANs. In such cases, data transfer may have to take
place via USB hard disks or DLT tape sent by trusted couriers.
The volume of data transferred on a daily basis should also be
considered 50MB per user per day is not unusual. For 100 users,
that is 5GB of data daily. A 1.5Mbit/sec WAN link with no other
traffic can transfer about 500MB per hour. So 5GB takes about 10
hours of a dedicated 1.5Mbit/sec link, each day, to transfer. These are
rough estimates, but they illustrate the issue.
Even with large volumes, WAN links are inexpensive, so providing
the necessary bandwidth may not be a problem. Nevertheless,
bandwidth should certainly be considered during planning; at the very
least, transfer times should be thought through.