You (and probably everyone else) should always check the "skip incomplete" option.
That option tells TabloRipper to ignore recordings that aren't marked "complete" by your Tablo. While is show is in the process of recording, this flag is set to "incomplete". And once it completes successfully, it's reset to "complete". If a recording is interrupted, it remains "incomplete".
Enabling this option will always ignore "incomplete" recordings. But you can still rip them manually if you want too. But you can be sure that TabloRipper won't try to rip a show that's in the process of recording.
Here's the deeper dive: Are you using the latest (version 2.x.x) of TabloRipper? If you're still on an older version (1.x.x) you'll want to upgrade. Why? Newer versions of TabloRipper use the new/improved Tablo API which handles load balancing (the old API doesn't, and it's possible to swamp your Tablo with API requests). Older versions of TabloRipper try to be "gentle" with the older API, but it's still possible it (and other clients using the older API) could overload your Tablo.