Have a look at rsync-sidekick maybe.

Not sure why I see this one recommended so much. Seems like it’s run by just one dude who won’t always be able to respond to support requests, security issues and other emergencies in the time frames you’d want with such a service. I also really wouldn’t want to bet my ability to securely access/send/receive important emails on that one person in Delaware not randomly getting hit by a car or something.

But n is commonly used for a total number. Using an index i to iterate over a number n of elements just makes more sense IMO.