Separate Software and storage

In my company we run Nextcloud and have a lot of data which we share with the nextcloud desktop client within and outside of the company. This is perfect for home office and everything.

Our issue is, that our NC is often outdated cause our IT company isn’t the best supporter for NC.

However is it possible to separate Nextcloud (server-software) from the storage. So that the Server is not self hostet, but the storage is on the company server?

The Nextcloud server offer me as SAAS NC files, Collabora, mail, elastic search, … everything is maintained by an external company and the storage, so the private data is on a company server.