I'm using BackupPC https://backuppc.github.io/backuppc/ https://backuppc.github.io/backuppc/ to do these kinds of backups. It does all the deduplication so the

I'm using BackupPC https://backuppc.github.io/backuppc/ https://backuppc.github.io/backuppc/ to do these kinds of backups. It does all the deduplication so the total storage is smaller than you'd expect for multiple machines with lots of identical files.