What are some alternatives?
When comparing 700 files and Syncthing, you can also consider the following products
Dropbox - Online Sync and File Sharing
ownCloud - ownCloud is an open source project enabling businesses to host their own cloud storage while maintaining regulatory and compliance needs.
Google Drive - Access and sync your files anywhere
FileTransfer.io - Send your files safely up to 6GB for free. No download speed limit. No registration needed.
Mega - Secure File Storage and collaboration
IPFS - IPFS is the permanent web. A new peer-to-peer hypermedia protocol.