This is a +1 for Veeam. I used it at work in our data center and use it
at home on my small network (1 blade server with about a dozen VMs, and
4 PCs). Granted, these are all running on a 1gb connection, but it's lickety split for the diffs. The first full backup takes a while, not gonna lie.

Way back before my work moved everything to the cloud, this is what our IT team used. The few times we had to restore a backup it just worked & was pretty quick for the amount of data involved.

... Windows Error: 061 - WIN.COM not found - type WIN for exit ...

--- Mystic BBS v1.12 A48 (Linux/64)
* Origin: 2o fOr beeRS bbs>>>20ForBeers.com:1337 (21:2/150)