spideroak.comは安全ですか？

Don't trust your files to be safe there; it appears to appeal to illegal uses due to lack of a reliable abuse contact and its "Zero knowledge" advertising. If you would like to risk having your files deleted in a Megaupload style raid, then by all means use them.

There lacking so many settings like the ability to turn off back up automation, you MUST install there software to use them and can not simply use an online interface and they don't uninstall properly and leave all sorts of files. THose 3 strikes are enough for me to block them for an eternity and at best personal reference however, heads up to all else. I would avoid these kind of things i call :"Nany-ware".

"SpiderOak is a US based company..." (Wikipedia). Therefore, its servers are subject to #PRISM NSA project. "Some components of SpiderOak are open source, and the company has announced their intent for the client to be fully open source in the future." Wikipedia Well, let me know when they get fully open source, then I may change the rating.

Good file sharing / back-up. Except that it is a little slow sometimes, it works nicely. Because the stored data is encrypted, your data will stay private except for when you share it using the available sharing functions. Although this offer better privacy than -say- Dropbox (http://get-dropbox.tk), the drawback is that if you loose your password, you'll lose your data that's encrypted with it. Always make sure you will remember your password. SpiderOak does also have a web viewing functionality; see here for a screenshot: ***** SpiderOak does also have a referral program, but it offers TWICE the amount of storage per referral Dropbox gives. So if you want to sign up and get 50% EXTRA STORAGE SPACE for FREE (1 GB extra), feel free to use my referral link https://spideroak.com/download/referral/f079df8d6ae7ce48f586b82624e03d76. Data is encrypted with AES-256 using a hashed and salted password; see https://spideroak.com/engineering_matters#encryption_specifications.

Solid, well-designed backup system that works over multiple computers and platforms. Flexible restore options. Friendly and helpful customer service. Better than DropBox for backups, but quite not as flexible for auto-synchronising between computers.