While I do see a difference between those two “incentives”, they are not that different to me. Both are about the general economic conditions which a company uses to determine where to invest. Also in both cases the conditions are influenced by politics, and shaped by financial policies.

[…] there is no incentive for companies to go and open their doors in east Germany […] They are building modern factories with high automations and are getting massive incentives to do so.

Which one is it? No incentives? Massive incentives?

1. So, you do want to run rsnapshot on the Borg repository (the destination to which is backed up)? Both rsnapshot and Borg keep a history, so you are keeping a history of when the Borg repository had which history. This will not be particularly efficient nor “as intended”.
2. be aware that Borg does incremental backups on file chunks, while rsnapshot works on whole files. So if a large file changes, rsnapshot will duplicate the storage used.
3. a Borg repository is more like a database of chunks (similar to git), while rsnapshot recreates the original backup data.

According to https://borgbackup.readthedocs.io/en/stable/internals/data-structures.html the repository storage consists of 500mb files. So using rsnapshot on those, will not be work as you want it to.