Dropbox is a free service for sharing files between Macs and accessing them from the Web. It can work with EagleFiler so long as only one Mac is using the library at a time. Dropbox currently has limited support for Mac files. It does not support resource forks, extended attributes, labels, bundle bits, and other HFS metadata. If you use an encrypted EagleFiler library (in sparse disk image format), this will not be a problem. EagleFiler will wrap up your library and all its files into a single .sparseimage file that Dropbox can correctly sync. If you do not use an encrypted library, you must consider the possibility that Dropbox will throw away parts of certain files when syncing, causing you to lose data. If you have detailed knowledge of what kind of metadata your files have, and whether it needs to be preserved, you can decide for yourself whether or not this is a problem for you. If in doubt, you should use an encrypted library.