Honestly I'd do weekly backups, not monthly. Use an incremental backup solution so it doesn't fill up the disk and eat through the server's monthly bandwidth limits.

What I did when I ran the site was use a GRE tunnel as a reverse proxy. That let us host with an ISP that would absolutely not allow guro, but they had no idea and never could find out. Then the GRE tunnel was hosted with a cheap service that allowed that content, and if they ever stopped, we could have moved to another GRE tunnel without ever migrating all the data. You should give that some consideration if it helps.

I don't know how much you're currently paying for the servers, but I just sent $120 to the XMR donation address, which should cover 6 months at $20/month.