![]() ![]() That can avoid you worrying about the drive being stolen or examined when you’re not around. I recommend using disk encryption for backup drives (Control-click the drive and choose the Encryption item), because at rest a macOS-encrypted volume is extremely secure. You can wind up with a compounded problem: If your Time Machine volume contains other data besides the Time Machine container, some of the cloud archiving services won’t back up that non-Time Machine data! (This column was prompted by a reader who hit that issue with Backblaze.) ![]() If you have caps or throttles on your broadband data upload, Time Machine backups can easily push you over, too, for this reason. However, CrashPlan’s archive grew to 303.5GB. Over a week, that Mac’s Time Machine backup reached 63GB. (This also makes it difficult to copy a Time Machine backup from one volume to another without bloating the size.)Ĭode42 tested how quickly Time Machine archives grew with a 53GB volume on a Mac. If you back up files from that volume using file-based archiving software, hard links are copied each time they appear. It’s clever, but it only works within a single volume. These hard links can appear multiple times in a volume, but all refer to a single file. That omits making a fresh copy of any file that remains the same between those bakcups. The primary issue is that Time Machine uses a special kind of alias, called a hard link, to create complete snapshots for each point in time that a backup operation happens. The issue with Time Machine and onlne backup
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