Tecadmin published a guide about installing ownCloud on Debian GNU/Linux 10.

How to Install ownCloud on Debian 10 (Buster)

ownCloud is a software application provide self hosted file hosting services. You can install owncloud application on your server and use it as your own file server. Where you can easily upload/sync files from the client machine. It also provides options to sync and share across devices—all under your control. 

How to Install ownCloud on Debian 10 (Buster)