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You are welcome Cacializ. GNU sed -i has a backup option:
-i[SUFFIX], --in-place[=SUFFIX]
The BSD sed man page says you should always use it. Anyway in general it is always a good idea to have...

Hi, with sed you can try:
sed 's|<td>\([0-9]\{1,\}\)</td>|<td><button onclick="reset(\1)">Reset</button>\1</td>|' file
You can add the leading tabs if you need them, but in the sample there were...