How much memory does BackWPup need?
BackWPup has no specific requirements with regards to RAM, but as the whole WordPress installation』s storage requirement depends from many other factors, one cannot generally say how much RAM is sufficient.
The following factors may have, amongst others, an influence on the storage requirement:
Plugins
Themes
Cron jobs
Many users on the same page
And a lot more
How big should the RAM for BackWPup be?
BackWPup carries out extensive operations with crons, and when performing cron jobs while many users visit the website and while the server needs to deal with many other tasks, it is possible that 512 MB RAM reach its limits.