Is there an entry-level NAS server for home/small office with functional backup?

Question

Backup

Who has experience in setting up network storages at the level of a house - a small office, please share which models have the functionality of backing up information in case of loss of files from accidental deletion or as a result of a virus, you need to make a full copy once a week and a differential or incremental copy every day to the network network share using the storage itself, the network share must not be editable except for a specially registered user.
A variant with a self-assembled storage based on a conventional system unit is also being considered, maybe someone will advise the current OS for storage with voiced functionality out of the box that he uses and configured backup in it.

Answer 1

In fact, most modern ready-made nas have similar functionality.
The second option is the collection itself, for example, on a microserver from xp, the old version can now be found at an affordable price.
But the best option for such a task, I would choose a free solution from veeam + a network folder on nas.