Windows Home Server does this for up to 10 connected computers - and includes the operating system and application files. so that you can perform a bare metal restore. And this kind of backup is better than the most other methods, which require
you to know, where documents are stored, which files are documents and are considered important and does not overload the backup capacity after a few days. (I.e. Outlook PST files are also documents in this sense, and having multiple copies from them can be
disk eating.) Also more manual backups, based on scripts pointing to certain file types or folders, may fail due to the files being open all the time.
You can train (often) your users to use shared folders on a server to store all documents, but you can't do so with applications in some cases.
Best greetings from Germany
Olaf