The answer
A descriptor captures the script/address construction rules and may include key origins, thresholds and derivation information. That context can be essential for restoring advanced wallets correctly.
What to do next
Back up descriptors and wallet policies separately from sensitive signing secrets, especially for multisig.
Trezor hardware wallets
Potential cold-storage product; not a substitute for safe backup procedures. Availability, supported assets and local eligibility must be checked before signing up or buying.
Visit Trezor hardware wallets ↗Official provider link · Compare suitability and availability before choosing.