how large should external hard drive be for time machine backup ?
how large should external hard drive be for time machine backup ?
iMac 27″, macOS 10.14
Question marked as
2 to 3 Time the size of your Internal HD is the general rule.
Back up your Mac with Time Machine - Apple Support
You can cheat a little if you are not regularly adding a lot of media files. For example, a 1T external drive can easily backup an internal drive with 300 to 400GB of data.