A corollary would be: how do I know that the space BackupPC is using
doesn't include a bunch of cruft like files from systems that have been
removed from BackupPC, or file systems that have been removed, ...
Somebody might have a script to check this, but you may have some backups that are lacking configured hosts. As I recall, when you delete a host from the interface, the data needs to be manually removed (and I believe there is a notification alluding to this). However, if it's just file systems, the files are likely pooled in other backups.
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