Feature request: allow raw backup to be managed by external script

[gaetanquentin]

Hi,

first of all thank you for your usefull tool.

I was wondering if it would be possible to let an external script manage raw backups, so we can manage all kind of backup styles ourself:

• aws s3 glacier deep_archive, with aws cli tool
• azure storage with az cli etc...

Regards,

Gaétan QUENTIN

[sbrudenell]

This would enable a lot of cloud backup use cases.

I wrote in https://github.com/digint/btrbk/issues/123#issuecomment-1114320750 about how s3fs (and maybe fuse as a whole) isn't production-quality. It's a very poor workaround for cloud backups.

Custom scripts could unlock a ton of options for users with little development effort.