Does installing new OS X delete everything?
No, installing OS X over itself does not delete files. It would be a good idea to make a backup before the install, that way you are covered if something goes wrong during the install.
Will a software update delete my files?
clicking the update now will not delete your files, but will remove incompatible software and place a file on your desktop with a list of removed software.
What will happen if I update my macOS?
If Software Update says that your Mac is up to date, then macOS and all of the apps it installs are up to date, including Safari, Messages, Mail, Music, Photos, FaceTime, Calendar, and Books.
Is it possible to update Mac without losing files?
Preparations for Updating Mac Without Losing Files Apple’s macOS is at number 15 already. From one macOS to another, the most recent release, dubbed “Mojave”, takes the best parts of the previous 14 releases and makes them even better. Mojave is consolidated with new apps, features, and of course, better performance.
When do you delete files on a Mac?
There is a nightly script that runs to delete them in Mac OS X as long as you are in screen saver, but not always in Energy Saver, or they are deleted right after the machine wakes from sleep. The latter function could explain the lag to wake from sleep. Those log files can be deleted if you are running low on space.
What to do if you lose data when reinstalling Mac?
If data loss occurred after you reinstalled macOS, you can follow the next part to recover your missing files. If you have backed up your Mac before the reinstallation, you can retrieve your data from Time Machine, an external hard drive, or somewhere else, depending on the way you used to make the backup.
How to recover data from Mac OS X El Capitan?
As long as you do not save new files into the data lost hard drive, you can recover data from Mac OS X El Capitan successfully. Generally speaking, FoneLab Data Retriever can be a deleted SD card data recovery and deleted document recovery and help you extract all deleted and lost Mac files.