Deja Vu sounds good; I have to admit that I've turned my current focus for online backups to Backblaze, which claims to do a sort of instant backup that I assume is based on fsevent. It's doing the initial backup now as part of a 15-day trial. One very handy feature for those of us with desktop computers: it lets you specify the work directory. I have an SSD primary and spinny secondary drive, so that's very handy.There's a new version of a unique Mac backup system:
I am still using Arq for daily backups, Carbon Copy Cloner for monthly clones, and, um, that IMAP backup program mentioned earlier for the email servers.