  We present characterization and storage methods for a high-finesse nanofiber
Fabry-P\'{e}rot resonator. Reflection spectroscopy from both ends of the
resonator allows for evaluation of the mirror transmittances and optical loss
inside the resonator. To maintain the quality of the nanofiber resonator after
the fabrication, we have developed a portable storage container. By filling the
container with dry, clean nitrogen gas, we can prevent contamination of the
nanofiber during storage. This approach allows us to minimize the additional
optical loss to less than 0.08% over a week. The portable container facilitates
both the fabrication and subsequent experimentation with the resonator in
different locations. This flexibility expands the range of applications,
including quantum optics, communication, and sensing.
