I guess I'm kind of old school.

Because my data changes slowly (mostly the addition of new eBooks and audio books, plus a bit of in-house accounting) and loss of the data would be annoying but not life-changing, I just run backups manually as the need arises.

One set of backups is to separate internal drives in the tower case.
Another set is to a pair of external drives sitting out on my desk.
The final set is kept off-premises and only updated every few months.

Simple, works for me, only takes a few keystrokes to do. I can fully understand why someone whose data is critically important might prefer a more robust backup system.

tanstaafl.