I am looking for a backup solution to backup all my data (about 3-4TB).

I have look at many services out there, such as:

• http://www.backblaze.com/
• http://www.crashplan.com/

Those services look very good, and a reasonable price.

But I am worried about them because of incidents like this:

• http://jeffreydonenfeld.com/blog/2011/12/crashplan-online-backup-lost-my-entire-backup-archive/

I am wondering if there is any online back solution that offers a service level agreement (SLA) with compensation for data loss at a reasonable price (under $30 per month).

Or is there a good solution that offers a high enough level of redundancy to mitigate the risk?

Required:

• Offsite backup to prevent data loss in terms of fire/theft.
• Redundancy to protect the backup from corruption.
• A reasonable cost (< $30 per month).
• A SLA in case the service provider faults on its agreements.