Backup a Mac

If you want to backup your Mac, you will need to use an external drive and TimeMachine.

https://support.apple.com/en-us/HT201250

If you use iCloud on your Mac, it is a sync service. You can use it to sync e.g. photos and files

https://support.apple.com/en-us/HT208682

You're very welcome. Have a nice day.

Good to know: a first Time Machine backup can take a long time. Further backups perform really quickly