I use regulary backups to store my data both locally on another drive and on a cloud storage for all my primary devices (except phones, for now).
I don't know how useful those checksums are if you have to fear for corruption due to issues in the implementention, see the recent openzfs problem.
Follow
zfs isn't about solving for backups. If you use zfs and your data is important, you should still have backups (zfs can help facilitate implement of a back up process). zfs is for making sure your data isn't corrupted and you can quickly fix, restore, and move your data in a way that gives more confidence that the data is what you intend it to be when want you use it.
