A backup is a separate workbook copy you can return to if a later maintenance step or update does not give the expected result. Make it before starting the change, while the workbook still contains the version you want to protect.
The useful check is whether you can open that copy and find the records you expect. A clear file name and a few checks of recent entries help you recognize what it protects, rather than leaving you with several similar files and no confidence about which one is current.
Begin with the workbook that contains the latest farm work. If there are several similarly named copies, identify the current one before making another. Otherwise a new backup could simply preserve an older version that is already missing recent entries.
An archive and a backup serve different purposes. An archive puts eligible history aside within its workbook, where it can later be retrieved or restored. A separate workbook copy gives you another file; losing the working workbook can also lose the archive inside it.
This practice version does not automatically update the workbook you use for real farm records. Before accepting an update, establish which file will change and how your existing records will be kept. Copying the workbook preserves its contents but does not automatically install or authorize the add-on for another account.
Make the separate copy before archiving, restoring or accepting an update, while the workbook still represents your starting point. Include a date and purpose in the file name so that you can distinguish it from the working file and older copies later.
Open the copy and check known records rather than relying only on the copy confirmation. Finding a recent note or entry gives you evidence that the safeguard contains the work you intended to protect.
Use File → Make a copy in Google Sheets, then open the resulting file and verify it. Keep it separate from the file you are about to change and retain both until the work has been checked.
If you cannot tell which workbook contains the latest entries, resolve that first. A clearly identified current file and a verified copy are easier to recover from than a collection of copies whose contents are uncertain.