If you create a ldif file every hour, you will have to export the database and the vault files every hour ....
because in version 8, aphelion contains data like Context Groups, Contexts ... related to data in your database Context Roles, Products-Libraries-...
and you know the vaulted files are referenced by the database ....
So ... backup aphelion every hour is unuseful.
As a conclusion, just make a backup every night and you will just loose a 1 day work.
- Nicolas W.