I have a master spreadsheet that I make multiple (10-50) changes to
cells per day. I sort and filter it every which way as well as cut and
paste from similar spreadsheets. I've been backing up the sheet on a
thumb drive and on a separate computer every night but I'm concerned
about corrupting the spreadsheet by user error then overwriting the
saved copies only to find out days later that I left one column out of
the sort or pasted from one sheet to another without copying all the
info.

The only way I can think to protect against this is to save maybe 5
separate days backups and overwriting the first day on the 6th day
etc. So if I do notice 2 or 3 days later that I made a mistake that
threw everything off by one column or row I can at least salvage the
master with the correct formatting while trying to piece together the
corrupt info from the day or two since.

My question: Is there a standard (easier) way of doing this or does
everyone just backup their master spreadsheet the best way they see
fit?