[dgroshev]

You can't if you have even moderately complex storage (like an SQL database). There is only one version of that, and while you can make sure that you can run one other version in parallel, it's just one version and a lot of extra complexity.

[theshrike79]

It depends on your schema, I've worked with systems where we have multiple clients in a single system, the data was separated with per-client views.

And it also depends whether the database is MSSQL ($2k/month on AWS) or something like Aurora.