I use Dropbox for synching only. I don't consider it a backup. For backup, my solution is redundant: I have a local Time Machine backup that is going continua

I use Dropbox for synching only. I don't consider it a backup. For backup, my solution is redundant: I have a local Time Machine backup that is going continually. This allows me to quickly recover from most problems. However, if my house ever blew up, it wouldn't be sufficient, so in addition... I have a Backblaze account. $5/month for everything on one computer, which is fine because Dropbox syncs my laptop to that computer. That backup runs continuously and keeps 30 days history (so if I delete a file and need to get it back, I can). Since I only care about disaster recovery here, if my house does blow up, they'll send me a hard drive with everything for around $100. The combination means I feel pretty comfortable. I just hope my house doesn't blow up!