backups, that's the part of scavenge
Now, we have been down this road MANY times. Scavenge skips days, doesn't always run, idk, I couldn't even find the cron where the panel set it. Many of us running production shared hosting noticed skips in stats.
Second, resource usage does not magically update! If you run scavenge once a day, and a client spends all day uploading, downloading, video, whatever, resource limits can and have been abused. I run a fixtraffic cron to keep client resource usuage up to date (4 hours isn't really up to date, but better than 24!). This is another reason we need quota use in KloxoMR.
that's all.