Is it possible to set up a local server for tarsnap, or is the client only for usage with the tarsnap service? And since the client isn't open source (but is distributed as source code), would it be a license violation if someone reverse-engineered the protocol to write an open server component?
For cloud-based backups, my preference would be to backup locally first, then sync that to a cloud service, since restoring from a local box is faster than remote. It might be a fun project to create an intermediary server which the tarsnap client talks to, and have that server then forward everything to the cloud service.
Is it possible to set up a local server for tarsnap, or is the client only for usage with the tarsnap service?
It's just for the Tarsnap service.
And since the client isn't open source (but is distributed as source code), would it be a license violation if someone reverse-engineered the protocol to write an open server component?
https://www.tarsnap.com/
EDIT: it will require some manual fiddling, especially if have multiple machines, so it's not an option that passes all criterias from the article.