Windows 10: how to backup only .xls & xlsx files in Win10 on offline computer

how to backup only .xls & xlsx files in Win10 Pro Insider on offline computer ( no internet connection but office pro 2016 installed , most times no login to MS account on my uncles PC )

so that I can backup only excel files with extension .xls & .xlsx over portable HDD or Pendrive offline on Win 10
if it is not possible by Win 10 Pro Insider built in fuction then kindly recommend me software free or paid all are welcome
if possible then give me steps please
I tried Genie and NovaBackup and selected others but it looks so hard at least for me

I want software that can scan my whole PC for .xls and .xlsx files and backup it will encryption bz my Uncle is so Noob outside Excel , Auto pilot needed

thanks in advanced


:)

 

Update on Zune included office 365, now I can't edit excel sheets

Are your Excel files .xls or .xlsx? The phone will now only allow edits on the new format (.xlsx), not the old one (.xls).

 

it says can't edit the file. Why..what is the solution..

Excel 2003 files (.xls) cannot be edited on the phone. The phone will only edit .xlsx files.

 

Open File Explorer in This PC, type ext:xls to Search. This searches the whole PC for files with extension XLS or an extension starting with XLS (like XLSX). When done, select all files and copy them, paste to anywhere where you want to store them.



(Click to enlarge.)

 

Search ext:xls returns all variants of xls *Wink

You could also try:
Free Utility: RichCopy, an Advanced Alternative to RoboCopy
-- OR --
You could create a Scheduled task that runs RoboCopy with the parameters that meet your requirements.