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Having to manage a server and all the websites that rely on it is not a trivial matter.

You must know how to choose the most suitable hardware architecture for the project you intend to carry out, having the foresight to choose a machine capable of satisfying subsequent technological advances due to ever-increasing needs.

You have to choose the connection that can support the current and future load of data to be transferred online.

A good sysadmin will always check that the code of the sites is always in line with the machine code and that any system updates do not clash with old system configurations.

First, the number of websites hosted on a server should be defined.

Generally, in fact, a server hosts more than one site, based on its capabilities. It would be completely useless to use a server for a simple site: the management costs would greatly exceed the need for the server itself.

But let's see the characteristics that determine the possibilities of each sever. First of all, its capacity in terms of hard disk storage space is fundamental. Capacity is measured in bytes and its multiples:
- Kilobytes = 1,000 bytes
- MegaBytes = 1,000,000 bytes
- Gigabytes = 1,000,000,000 bytes
- Terabytes = 1,000,000,000,000 bytes
Obviously, the higher the level of the company that manages the server, the more storage space will be.

The other aspect, less fundamental, but still crucial is the transmission speed, and I say crucial but not fundamental because a server can also be slow, but this does not speak in favor of its reliability. But let's take a closer look at this aspect. A website generally does not have such a high weight as to need who knows what connection. But, of course, we don't have to think about this neither on a single site, nor on a single user. There are websites, such as portals or even simply like those of large international companies, which provide information via the web, even very broad ones, but above all to a series of interminable users. overall high transmission rate, and therefore a connection capable of satisfying this amount of requests.

To determine the importance of a sysadmin you need to understand how often these sites are updated.
Yep, because with each update of the system the system may no longer be suitable to support that change. Behind the graphic appearance of a website there are interminable lines of computer code, an indefinite number of files which, all together, contribute to the style, but also to the functioning of the various components and of the site itself.

But what a non-expert generally ignores is that:
- There are several web programming languages (similar, compatible and complementary)
- There are different versions of each programming language, generally different according to the software release date
- Even the machine on which websites run are made up of programming languages, also different and also in constant evolution

And here is that the relationship between these components must always be studied in detail.

Here we are at the heart of the work of a Sysadmin: it manages the hardware equipment, which is the very basis of the operation of a system, and the software of the equipment that directs its operation.

Generally, the hardware part does not require special maintenance, unless it breaks. Once the hardware has been set up, the configuration should be ready to use for at least an undetermined amount of time.
However, as time goes by, it is certainly possible to re-evaluate the computer hardware to better adapt it to higher needs that have arisen with the development of the brand.

As for the volatile part, the trend is different. Software companies, whether they are open-source or holders of paid code, periodically update their product: it is part of the service. With the technical improvements at the hardware level and with the emergence of third-party needs, the market must update itself and study new solutions.
And with the development of the software, the adaptation (or rather the configuration) of the services connected to them changes; and, even without realizing it, you could run into a malfunction that the sysadmin has to deal with.