That's also a good option. If the primary DB is frozen in time and if this data is mostly written and not read, you could even have a separate MySQL connection with the newest version that only contains the table to store this data that gets updated asynchronously (read "eventually consistent").
You'd recycle the same tooling, company expertise and learn new things that might help in the future to upgrade the main DB if you ever chose to do so.
Adopting a completely new storage server is a big investment (in terms of money, devops, time and so on), I'd prioritise a way to decrease that impact if it's technologically feasible
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That's also a good option. If the primary DB is frozen in time and if this data is mostly written and not read, you could even have a separate MySQL connection with the newest version that only contains the table to store this data that gets updated asynchronously (read "eventually consistent").
You'd recycle the same tooling, company expertise and learn new things that might help in the future to upgrade the main DB if you ever chose to do so.
Adopting a completely new storage server is a big investment (in terms of money, devops, time and so on), I'd prioritise a way to decrease that impact if it's technologically feasible