Personally I use code guard https://www.codeguard.com/
Not MODX specific but I wrote a php script that backs up the DB's and filesystem, zips the data, encrypts, then uploads to a AWS S3 bucket. I run it as a cronjob.
It's not in a suitable state to release but is on my todo list for the new year!
I guess it could be adapted to place the encrypted zip on the same hosting solution as well?
I guess it could be adapted to place the encrypted zip on the same hosting solution as well?
Yes wouldn't even need adapting as I separated each step of the process. You just wouldn't run the upload stage.
Good to know someone else might find it useful, I'll release on github some point in Q1 and let you know.