Yep, I do the same. Depending on size of data being affected, level of table RI in place,and necessity of seeing the data again later, or client calling back the following day/week having changed their mind and can we 'undo' that, I will often tack in a select into tablename_changes_jan7_2020 or some such convention to grab the unchanged records. Qty, backup retention options etc also play into this so use some common sense of course. If you worry about space, just set an drop table job up to clear it after a month or whatever.
Lots of these CYA tricks if you want to make sure you don't shoot yourself in the foot.