backups and syncs

Hello Red Team all here.

My OS is RHEL 8.1. in AMD based laptop.

My goal is now manage backups system config and etc for future purpose if something breaks from me as i have less experience on it. and also sync a files / personal materials daily or once a week in a storage or external hdd or cloud and etc. also be possible if i will make changes in a file it automatically been synced that. changes which i made.

i searched in google and found about rsync but it sync in remote PC only as if i heard correctly.

i have attached second 500 gb hdd attached to laptop.

any suggestions would be appreciated.

Thanks.