Same here Flex.....
I save to a new file name daily, appending the file name with the days date, such as;
1210 formax 03 20 19.vlp
If I do a lot of changes I will sometimes add an A, B, C after the date and have multiple saves in a day, plus I add the PLC model to the name also.
So far as storage, I work off a USB hard drive, and try to be diligent about copying my files to my C drive and a network drive.
And as in other recent discussions, I'll save my version number somewhere on a display; v032019