I’ve been doing incremental backups on UrBackup folder of RAID5 4TB drive (S:\Urbackup) on Win Srv 2008 R2, and currently filled 2.8TB. I’ve decided to move the backup to the new external 5TB drive, but it fails with “not enough space at the destination drive” after scanning for few hours.
Looking at the Windows Explorer, it shows ~1.2TB free of 3.63TB, which is correct. However, when I open the property of the folder UrBackup, it shows 5.56TB. I’ve googled and seems to be some bug in windows causing miscalculation of the folder size. But these complaints are all underestimating the actual size. In my case, it’s far exceeding the actual size.
So, thinking it’s possibly just the miscalculation by Windows, I’ve attempted third party backup program (SyncBack), which doesn’t care to scan and calculate the size, to copy the folder. But after several days of copying, my new 5TB has filled up while 560GB is still needing to be copied. How is this possible?