Deleting products is deleting images ?!

Hey,

I thought i export my data so i have it safe.
Then i removed those products and re-imported them.
All images were also deleted because of that.
With importing i found i had no more images left.
Anyone can tell me how i can solve this the next time ?
I never want it to happen again that i lose data!

Thanks in advance

Check the files admin to be sure the images aren’t there.
Renaming of file names may have happened so import cannot find things.