What if the backup is replaced by synchronization with the storage of old versions?

Question

System administration

I have tried quite a few backup programs like Cobian Backup, Acronis, UrBackup, etc. All of them have one big minus: a full backup takes a lot of time and space, and although there is an incremental one, but still a full one once a month, but you need to do it . UrBackup is somewhat better in this regard, since there is deduplication, but still not the same. And I have a small office and several machines with large amounts of data (50-100GB) on their disks. And everything needs to be reserved somehow. And sometimes they ask to restore files deleted six months or a year ago. You can imagine how much space all these copies take up. In general, it is often impossible to fulfill a request.
And now to the point. Found an interesting program FreeFileSync. It can "mirror" a directory, detect moved files, and archive deleted and old versions into folders like YYYY-MM-DD. In total, I always have the last full copy and many, many folders with previously deleted or simply overwritten files. The depth of history will easily reach a year with minimal space consumption. Plus, you can immediately see which files were affected and when. And most importantly - backup and archiving in one bottle, and without proprietary archive formats.
And now the question is: How "professional" is that? Is this practice generally followed? What "rake" can I face in the future?
So far I see only solid pluses, but as they say, if everything looks too good, then something is wrong here ...
Addendum 1. And how do you like BackupPC?

Answer 1

The question of professionalism is formulated something like this: "If it works stably and performs the necessary functions, the application is advisable."
A similar technology for storing backups was described back in 2006. in a book about Google SRE practices. This is called "Lazy deletion".
In fact, this is a version control system (like GIT), which processes file deletion with a delay. Those. marks deleted, but actually deletes after some time.