All storage media is corruptible, analog and digital, so multiple copies reduce the risk that the recordings will be lost to corruption.
The technology for playing back recordings changes with time, so migrate some copies of the recordings to current technology, both hardware and encoding (type of digital format).
Multiple storage locations, including online services, reduce the risk of lost due to a local disaster, such as fire, flood, transient electromagnetic disturbance, civil unrest, war, etc.
"Data storage lifespans: How long will media really last?” is a short article for various digital media.
https://www.arcserve.com/blog/data-storage-lifespans-how-long-will-media-really-lastYep, this is one more thing that needs to be added to your routine schedule.
Sincerely,
Clif
Clifton Patrick
Town of Chester Historian
119 Brookside Ave.
Chester, County of Orange
New York 10918
direct phone/fax 845-469-7645
chester-ny.gov/town-departments/historian/