Alternatively you could use a combination of AES and RSA similar how pghoard implements it: https://github.com/ohmu/pghoard

The RSA keys (or path to them) would be passed as environment variables. It would be a little easier to setup than gpg (especially for automatic backup restoration).

Do you have plans to support encrypted backups?

Maybe. Depends what you mean by that: https://news.ycombinator.com/item?id=15049691

There are also more advanced packages:

https://www.npmjs.com/package/node-noop https://www.npmjs.com/package/lodash.noop