@sameermhaisekar Currently backup reports have been made non-editable. However there are plans to make it editable in near future.
Updating the answer for follow up query. Technically it is possible to know the queries used as Backup Reports template, which is publicly accessible from Workbooks github repo. You can visit this link , copy the contents of the file into a new workbook and then edit it to see the queries used.
Please be informed that these queries are not very suited for customization. So our Product teams recommendation is to wait for edit functionality to be made available later this year, however if your requirement is time sensitive you can also use the above method to see the queries.
Please feel free to circle back if you have any further queries. Thank you