I have an byteball backup from 2017. How can I return the backup? Now that byteball is Obyte?
what i know is , safe the wallet.dat , and reinstall the wallet and replace the old wallet with the new one...
Don't think it works this way.
Have a look at this good article
https://steemit.com/byteball/@profchydon/how-to-perform-a-full-backup-and-restore-for-your-byte-walletIt has been written before the rebranding to Obyte but the wallet still works same way as before I guess.
So download the latest version a perform a restore from backup/fullbackup dependng on how you saved it two years ago.
Exactly, Obyte is not a Bitcoin fork, so there is no wallet.dat, you need to use the "Full backup" from the settings and then "Restore from full backup" on new device. After that you should stop using the old device.