On Thu, Mar 4, 2021 at 9:50 AM Matthew Miller mattdm@fedoraproject.org wrote:
On Wed, Mar 03, 2021 at 05:40:19PM -0800, Samuel Sieb wrote:
There are a few different types of full-disk backup, but if it's file-based and the atimes are modified, that's the intent of the backup process. The atimes are used to determine which files to backup. A scrub is not a backup and shouldn't modify the atimes.
I can't imagine why you would use atime instead of ctime for backups.
Also, this seems really easy to game. Why not maintain a checksum record instead? That makes it possible to maintain more efficient deltas. Using atimes/mtimes is just asking for trouble.