We take the security of your data seriously. Firstly, your daily backups will only be the incremental blocks of data that have changed since the last backup, so even if someone could intercept your data, it would be near impossible to assemble a complete file. Second, and more importantly, all your data is encrypted using a NIST FIPS certified AES256 encryption module. That means your data is encrypted while on the fly during backup, and while at rest on our storage infrastructure.
Only you have the encryption key. We do not keep a copy of your key and cannot read your data. The only exception is if the customer specifically wishes us to keep an encrypted electronic copy of the key using the Key Management feature of the software. If you are considering some other backup service, ask them who has the encryption key to the data they store.