Why will not the backup copies, so-called backups, help?

A malicious code, which has hit the site, as a rule, doesn’t show himself at once. This code can be activated at once, or in a day, or in a week - everything depends on the intruder’s imagination. Consequently, the impact of the code activation, such as readdressing, unnecessary links or site’s breakdown, can be noticed only after awhile. Sometimes it can be a month and even half a year. During this time a lot of changes and upgrades take place on the site, and when the owner recovers the site up to the last uninfected version, he loses all the latest changes and updates.
In most cases users do not care themselves to make regular backup copies, as it requires time, organization and place on the hard drive. They rely on the backup copies, automatically made by the hosting service. In its turn, most hosting services store automatically made backup copies only of a specified period; it can be one day, a week, two weeks or a month.
Let’s imagine that the virus hit the site, activated in a month and was found only a month and a half later. In this case webmaster finds and recovers the backup copy, for example, made a month ago and restores the site’s version with the already implemented, but not activated malicious code. The webmaster doesn’t see any obvious results of virus's work; it settles down and forgets about the virus. But sometime later the virus is activated once again. The webmaster finds and recovers an older backup copy, for example, made three months ago, which does has no virus. In this case the site is recovered clean, but it lacks three months of work on the site! And though even in this case the recovered site has no viruses, but is has those holes (vulnerabilities), through which the virus has hit the site. The site is still within eyeshot of the intruders, and they won’t miss the opportunity to send a virus again into the old hole.
The PHP Keeper service not only deletes the implemented viruses from the site, but also helps to find and eliminate those holes, through which the viruses hit the site.