Each night a crontab script runs an incremental backup to /media/bkup1, a 2TB WD Red hard drive with xfs as the file system. When that's finished a second crontab script copies those changes to /media/bkup2, another 2TB WD Red hard drive with xfs. The two disks have different amounts of space used: bkup1 has 471G, bkup2 has 600G.
I'm now copying /media/bkup1 to a 1TB flash drive mounted on /mnt/hd (with the default exFAT file system). So far, /mnt/hd has occupied 627G and it's still running. Why do the two backups of /media/bkup1 have larger file sizes and the SSD flash drive consuming more space than /media/bkup2? Does the file system difference between the WD Red hard drive and the SSD flash drive account for that difference? If so, why the difference between /media/bkup1 and /media/bkup2 on the same hardware brand, model, and capacity? A curious mind wants to learn. TIA, Rich
