I think you’ll find Second Copy is extremely versatile. I wrote a similar program about 25 years ago, and used it in a business office environment to back up each employee’s files onto their neighbor’s computer throughout the day (every 5 minutes). Since most files don’t change very often, only a few small files traversed the LAN every now and then, but each employee had a spare copy of what their neighbor was working on, which made it easy to recover something – just ask your co-worker.
After using it for a year or so, I discovered Centered Systems and Second Copy. It was very much better than the quick utility I had written, so we bought a site license. I’ve been running it on every system I have used ever since then. It has never – and I mean NEVER – crashed. I don’t think they have done any development for several years (there are a few refinements I’ve asked for, and they don’t seem actively involved anymore). But they have released invisible revisions when Windows updates cause minor issues.
There are also “secret” over-rides for some subtle technical situations, involving a text file that it reads when starting up. If you have problems, they DO respond to emails. That is, the company is not dead, but it seems uninterested in further development. I’d love to know how many copies they sell each year, since I haven’t seen an advertisement in many years!