Quanta 5, Quanta 6 and Quanta 70 devices do not have software functionality for redundant links. However, you can create two redundant links on them with using third-party devices based on public technologies.
The simplest scheme will be the organization of two links established at the 2 level of OSI via two Quanta 5, Quanta 6 or Quanta 70 devices. STP protocol excludes loops. The traffic will be transmitted through one of the links, but if it breaks, it will go to the next one.
Unfortunately, in this case, the use of one frequency for two pairs of devices is not desirable.