Besides various online genealogy programs (main program geneanet) I have summarized all names, dates and other facts in an Excel spreadsheet, which I had created as a dBase III spreadsheet in the early 1990s and have upconverted again and again over the years.
The backup used to be done every evening via 5.25 inch and later via 3.5 inch floppy disks. With the rise of sticks, I backed them up on those.
After also having several unrepairable hard drive failures, I put it all in a cloud in addition to storing it on my PC and also save it to an external hard drive once a week.
With the saves, I've lost very little data during the crashes, which I've been able to restore after a few hours of additional work.
I do the same with my more than 6500 copies of original documents.
Only linking from the Excel spreadsheet to the original documents, which are located in folders with the corresponding ancestor number, I have not yet tackled with hyperlinks.
To keep an overview, I still have my overviews in paper form, which I designed in the mid 1980s. After I had used DIN A4 formats at first, I have already changed to DIN A3 after a few days, so that I always get three generations on one page now. In addition to the relevant data, I also enter the corresponding places, so-called house letters, wills and other documents with statements about the ancestors. In order to keep the overall view and to look for something quickly or to explain connections, this is still the best possibility in my opinion.
I have about 4000 documents in the original or as a copy in folders in the basement, but I hardly use them.