Question?? How many saves are you running in your plays??

As for myself I only keep one additional save separate from the auto-save. Doing that works for me.

I save before and at the end of each major mission and sometimes on important side quest, especially those with major decisions that affect the rest of the series. This way I can explore the different outcome without having to do a complete playthrough again.

I always manual save before a stretch of doing anything new (exploring an area, progressing a quest, etc.). I make gratuitous use of quick-save as well (if I screw something up, the nearest manual save is never too far back).

I save often enough to run out of slots in ME2 (I don't even remember the limit in ME3; I never played the series again after beating it once). Since I play on PC, I always just copied the save folder and then trashed most of the manual saves (also, the interface actually handled more than the limit, so when you were done playing, you could put them all back in the save folder and load any of them up—you just can't get it to make a new save anymore); that way, I had all my progress still around when importing into the next game.

I haven't really played it yet, but if I do, I suspect my behavior will be the same with the remaster.

Around 80 - 90 per playthrough of one game. Why? Because I can and the game allows it. Is ist really necessary? I suppose not, but what is necessary that there are enough recent saves left in case something goes wrong: accidently picked the wrong answer, dying after a longer period of fighting, an unexpected bug or glitch or simply forgeting something before moving on. I had to learn the hard way that the almighty autosave isn't enough to deal with all situations. Saving manually on different slots sure came in handy during the years quite often. And after retiring a character, I simply delete most of the saves.

Save files are small in size and are easy to create. I don't say all people should create a huge amount of saves as I do, but at least consider a rotating system of at least 5 - 10 hard saves: saving before leaving the Normandy, before starting a main mission, saving before difficult choices, or prolonged fights. And I think this should be naturally with all roll playing games.

Over the years, a significant amount of problems in various other RPG supporting boards (Witcher series, Fallout series, Elder Scrolls, Gothic/Risen/Elex series) would've been solved or never even posted in the first place, if the OPs simply had saved on a regular basis. CDPR introduced three rotating auto save slots with Witcher 3, Piranha Bytes even six rotating slots for Elex as a consequence.

ME1 73 saves, ME2 93, ME3 99 (missed lots of places like Palaven's moon)

I almost always just overwrite my previous manual save, unless I have a reason to want to load back to an older point (occasionally for example I'll want to do both versions of the party in the Citadel DLC). I'm playing on Xbox One though and I've never had a corrupted save.

3-5 per career per game. try to have 3 manual saves, save one per mission then save on the next one for the next mission. then there's some odd milestone saves here and there if I want to take that save in a different direction. Can't say I've ever experienced a save file corruption in the new or old trilogy.

I do one main save that I usually do before every mission on the ship, and then on individual missions I save in a second slot before decisions or fights, which I then delete after the mission. 

I run the max on PS5 (like, 40 I think?), and overwrite the oldest with the newest as I go along.

Had one save corrupt on me so far, so glad I had another only 15 min behind 🙂

Apart from the quicksave I usually have one "current" save I use at the start of a new mission/quest in case anything goes wrong during the mission. This one I reuse.
Additionally, I tend to have one save per session I'm playing and/or saves before potentially important decisions, new planets, chapters, and such.