Just a quick note that ESFS, a FUSE-based filesystem I have been working on that supports snapshots, now seems to be relatively bug-free, and is available as beta from
GitHub. It is an overlay filesystem as it uses an underlying filesystem to carry out the file operations, and to save the data necessary to maintain the snapshots themselves. Through the snapshots, it provides read-only access to previous states of the whole filesystem, which can be used to restore data following some corruption caused by human error or software bug. In this sense, it provides a kind of backup solution, although on the same storage as the main filesystem itself.
Please visit the
GitHub Wiki for more and for usage and installation instructions.
