When comparing OwnCloud vs SpiderOak, the Slant community recommends OwnCloud for most people. In the question“What are the best cloud storage services?” OwnCloud is ranked 5th while SpiderOak is ranked 9th.
Ranked in these QuestionsQuestion Ranking
Pro Open source software
Pro Allows selective sync
Desktop clients offer sync almost as versatile as dropbox.
Pro You have full control with your data
Only chose a provider or host it on your soho-server.
Pro Available for many platforms
The Spideroak client is available for Linux, MacOS, Windows, Android and iOS.
Pro Zero knowledge
Data is locally encrypted before uploading to Spideroak. They cannot recover your data even if they wanted to since it is stored in encrypted state on their servers.
SpiderOak updates only that part of the file that has changed, saving bandwidth and time.
Pro Combines cloud syncing, storage service and backup client
Thus you have a single service for all of the things.
Con Not plug and play as Dropbox etc
You may need some help installing it on your web space, though some providers offer free install server.