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@Jiaai wrote:

otherwise client's data can be stolen, proseries is not safe.

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No computer is completely safe.  Not even a cloud hosting company.

However, there are many things that can be done to increase safety.  A cloud hosting company has IT-security experts that regularly monitor their computers, implement processes and install programs and/or hardware to increase safety. 

Do you have a IT security expert/company that checks and maintains your computer system and works with you to take precautions to increase safety?

Things like good passwords, Multi-Factor Authentication, anti-virus and firewalls are the first line of defense.  A good IT-security expert will set you up with that, but they also can do much more to decrease the likelihood of problems.