![]() ![]() Thus, the more space it has, the longer it can keep your backups. Starts deleting the oldest backups so it can keep making new ones. But it won't just quit backing-up when it runs out: it Its backups, since it will, by design, eventually use all the spaceĪvailable. This is a trade-off between space and how long Time Machine can keep Up large amounts of backup space, for various reasons. ![]() Tendency to add more and more data to our systems over time, so if inĭoubt, get a bigger one than you think you need now.Īlso, there are some OSX features and 3rd-party applications that take Unfortunately, it's rather hard to predict, and most of us have a ![]() A drive that's too small may only have roomįor a few weeks (or even days) of backups. To work, but that's subject to problems any time a large backup isĪnd, of course, the larger the drive, the more old backups Time If you're a light user, you might be able to get 1.5 times If youįrequently add/update lots of large files, then even 5 times may notīe enough. Sure to add the size of the data on any other drives/partitions youīut this varies greatly, depending on how you use your Mac. Time Machine needs 2 to 4 times as much space as the data it'sīacking-up (not necessarily the entire size of your internal HD). How big a drive do I need for Time Machine?Ī general "rule of thumb" is, to keep a reasonable "depth" of backups, You probably want to check out this website for the most information, but here is the answer to your question, quoted from the website above: 1. ![]()
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