Why the cow path must be a path on the block device?

datto / dattobd

kernel module for taking block-level snapshots and incremental backups of Linux block devices

GNU General Public License v2.0

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Why the cow path must be a path on the block device? #395

Open zekyang opened 22 hours ago

zekyang commented 22 hours ago

Hi, I have a question. why the cow path must be a path on the block device? If I want to snapshot a disk and save the backup data in the another disk, dattobd can do?