Using a network share as a Time Machine destination is problematic, even using Apple's own Time Capsule. An external hard disk plugged into the USB port of your Mac is much faster and much more reliable. The weakness is in the use of the sparse bundle disk image. A sparse bundle consists of a containing folder, a few database files, a plist that stores the current state of the image and nested subfolders containing many many thousands of small (8 MiB) 'band' files. An image file has to be used i
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