> If you’re looking for the highest level of privacy and a service that has all of the pieces in one place for backup, sync, and read-only folder sharing, SpiderOak offers the strongest solution. For backup, SpiderOak compares favorably with CrashPlan in features but less so in pricing.
I use [SpiderOak](https://spideroak.com/download/referral/7849b23e25b7c05a3bc49e43db2f11d6)[^f2625] in addition to [Dropbox](http://db.tt/bl7yQBc), but I consider it a secondary sync / storage location. So many iOS apps use Dropbox for syncing that it has to be on top of my sync / storage stack.
[^f2625]: Affiliate Link (where I get additional space on my account when people sign up through the link)