Store to file and backup at same time

Hello!
We have a very well working measurement software written in LabView. However we would like to backup the data files regularly. We want to be able to do this even during measurement and while the software is writing to the files. Now when we try to do so, we occasionally face "Error 5 occurred at Open/Create/Replace File" (in "Write To Spreadsheet File") because another software (backup, windows stuff, else...) accesses the files also. Now from my point of view this kind of concurring file access should not be a problem since LV is the only software writing to the files. There are 3 possible solutions I can think of:
delay the write (not feasible since you don't know how long to delay, e.g. how long the other software stays open)
queue the data and write it on next try (e.g. https://decibel.ni.com/content/docs/DOC-7212 - but again; how long to queue?)
the proper thing is; copy the file to a temporary one, edit the temporary, delete the original and move the temp. in this place
the last one should be the proper solution and also work on different OS since the copy/moving stuff should be atomic operations and thus safe in this context. However I implemented the solution and still have exactly the same problem but now in "Move File"... I am starting to doubt if it is possible to solve this issue at all and thus desparatly need help here! As I can see there is not lock or mutex on the file and no need for LV to raise an error (I think it is done as warning for future possible conflicts)... I assume it is some hidden/strange badly documented Windows API "feature" LV is using to detect those other accesses and it results in a behaviour I cannot change or fix - so what to do here...?
Thanks a lot in advance for any helpful suggestions or hints! Greetings
Ursin Solèr
Solved!
Go to Solution.

I Think you must have missunderstood me; the problem is you cannot open and write to a file while another external program has it opened too with exclusive access. Consider following code:
If you open the file during the "Wait" (it is closed then because "Write to Spreadsheet" does open, write, close) e.g. with MS Word wich does an exclusive open (allowing exclusive access only) then during the next loop your program will crash with error 5.
The solution I mentioned is to open it first in LV an keep it open all the time:
which prevent e.g. MS Word to open it exclusively but read-only!
What you mentioned is regarding a backup - I considered this double write long before, but it is no good solution, beacuse e.g. the other drive might be a network drive and I don not want to handle absent drives - that's something the external backup tool should do.

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