As far as I remember, there was a feature in CS:GO to backup rounds, however I can't find how to enable it. Also, when I checked my csgo folder, I saw some old round backups. Here is a picture of the last one (Notice the timestamp? It was my last day with my old pc. Also my last match was 10 mins ago):
I also found the command
mp_backup_round_file, but it is enabled.
"mp_backup_round_file" = "backup" "mp_backup_round_file_last" = "" "mp_backup_round_file_pattern" = "%prefix%_round%round%.txt"