1) Does it work well with huge files? 1GB+ etc? Will a 1-byte change mean complete download to all devices?
2) Does it work well with 100k small files in deeply nested folders?
3) Will you charge for software and/or support?
4) What happens when one of the devices doesn't have enough storage? 4GB SSD laptop vs. 100GB HDD.
5) Will any of my computers have to be up 24/7?
2. It should
3. We're not 100% sure how we're going to charge for it yet, but anyone who signs up for the beta will be grandfathered into whatever system we end up using (i.e. you won't have to pay)
4. I'm actually going to address this in a separate post, but we've designed it in such a way where you'll actually stream files from one device to the other (based on a least-recently-used policy), so in effect you should have access to ~104GB of data.
5. This relates to #4, but is up to you, largely. If you have computers that are up 24/7, great. If you don't, you can leverage our cloud servers for better availability.
I have, say, 500GB of music. It doesn't fit on my laptop, so it "lives" on an external HD. Could it sync the laptop with the HD so that I always still have access to a set chunk—say, 10GB—of my most-recently-used music files? This is a capability I've been waiting for something to support ever since I bought the drive.
Will your program be open source?