Comment by ericbarrett

I use it, it's fine as a "third place." Make sure you set the tier of the storage as the default Standard is fairly pricey. I use Standard-IA (Infrequently Accessed), which is still hot-readable but with a high retrieval charge—perfect for what should normally be write-only. A bucket policy ages out backups > 1 year. Encrypt your backups before you write them, of course.

There's nothing wrong with Backblaze et al. either. They may give much lower costs for bulk data. I only back up a few dozen GB so it's not worth opening another vendor relationship for me.

Somebody else suggested "hard drives at a relative's house." What's more likely, you lose S3 access—or your relative's house burns down / floods / is robbed / their kid yoinks a drive to use at school / any number of other disasters? Also, a backup should be as easy to do as possible—having to manually shuttle a drive back and forth from a remote location is probably not the best, unless you are extremely disciplined.