With any supplier, you also have to consider commercial and legal constraints; when those suppliers are in a different country, even more so.
If the data is originating in the European Union, there are numerous data privacy obligations which specifically cover sending certain kinds of information outside the EU. (See for example General Data Protection Regulations.) If you have anything which might be considered personal data, they are even more onerous. If you have "pure data", perhaps big piles of molecular force finite-element-modelling, then maybe it's not so onerous.
And just from a commercial point of view, you have to understand what country has jurisdiction for any civil or indeed criminal legal issues. Does your supplier have adequate (from your point of view) security for your own and your clients' data, IPR and so on? Do you have adequate access to legal support should things go wrong? Are decisions actually enforcable?
Be aware also of legislation which might cover things like encryption export control, especially of US-originated software. (See for example Export of cryptography from the US.)
I have no experience with data processing export from Berlin to Beijing specifically, but lots with UK, other EU, Hong Kong, USA, Canada.
Do not underestimate the challenges of international data processing across countries, languages, legal and judicial systems.
Just as Zac says, everything else is "just" a matter of firewalls, bandwidth, and latency.