Provides client-side encryption, automatic backup and sync with storage space.
Pros & Cons:
SpiderOak is not just an encryption program. It combines client-side encryption with 2 GB of free cloud storage (more storage is availale for a fee). In other words, you don't need a separate cloud-storage service. SpiderOak also provides sync between PCs and portable devices in addition to backup. In summary, SpiderOak provides encryption (Type 1 as defined in Selecting an Encryption Method for Cloud Storage), backup, sync and storage space. Backup and sync can be automatic.
SpiderOak uses Type 1 encryption (defined above in the Introduction), including its pros and cons. Files are unencrypted on all your synced devices, but are always encrypted for transmission and storage in the cloud. You can use SpiderOak for as many folders as you like. Of course you can use up the free 2 GB pretty quickly, but it is inexpensive to get more. It is challenging to discover all the functions of SpiderOak intuitively, but they have excellent "getting started" guides and a users manual.
The SpiderOak statement on privacy and passwords is a good example of what you should look for to evaluate the security of any encryption service for cloud storage. In particular, be very leary of any service that offers password recovery. If there is a mechanism for password recovery, it is likely your data on the server is also accessible to a determined hacker or agency.
I used SpiderOak for some time, and I liked the way it worked. One thing to understand is that SpiderOak breaks files into blocks so that only the changed or added sections of files need to be stored. That way many versions of the file by just storing the incremental blocks. It offers fine-grain control of the backup/sync process, which helps you stay within the 2 GB of free storage. It's a bit tricky to use SpiderOak until you get used to how it processes backups and syncing.
SpiderOak was reviewed by Gizmos Freeware on based on version 4.8.4.