It seems like they made the same mistake as youtube-dl back in the day. If you develop a tool that can be used for piracy, do not straight up advertise that in your readme/documentation.

If you create a YouTube downloader, do not show it downloading music from major labels, use for a creative commons track for the demo instead.

And dont say in the short description of your repo that this tool is meant to steal books from an online lending library.

You can access ZFS snapshots from the hidden .zfs folder at the root dir of your volume. From there you can restore individual files.

There is also a command line tool (httm) that lists all snapshotted versions of a files and allows you to restore them.

If the snapshot you want to restore from is on a remote machine, you can either send it over or scp/rsync the files from the .zfs directory.

Yes, it does. You can also use the tool to check if a file is cached (just run it without any arguments for that).

If you use a VPS as a backup target, you can also format it with ZFS and use replication. Sending snapshots is faster than using file-level backup tool, especially with a lot of small files.