Can Edge Sync be relied upon to work as an always up to date edge backup?

I recently had a nightmare where all three of my profiles were totally gone, and only one of them had sync setup, and that was the one that managed to recover itself (presumably by auto-syncing from the MS servers). So it seems like if I were to create a microsoft account for each of the profiles and enable sync (with ALL of the options enabled) then that scenario wouldn't be an issue if it happened again. As long as I logged into sync again on the 3 profiles I'd be good. I think I wouldn't even need to have the three profile names be the same, as long as they logged into their correct accounts. Right?

Background:
I wanted to downgrade Edge because I was experiencing some weird behavior and that turned out to be a bad decision for my non-synced profiles. Luckily I was able to recover from a system restore in safe mode, but it was looking bad for a while. It's making me paranoid now about having a backup. I saw that Shawn had created a guide to backing up edge folders in app data and registry, but it looks like sync would render that backup process as not necessary and would definitely be more up to date. The backup still has a use case, were you to delete stuff and it sync and then it's gone - you could restore it from your backup (but probably overwrite any new stuff).

My Edge syncs and has worked well for me....but I have only one profile. I cannot say anything about using multiple profiles.
In case of problems I have my images to rely on as well as all my favorites in Edge exported to a file that can be imported back into Edge if need be.
3 dots>favorites>3 dots again>export favorites

Sync works 99% of the time, but you have to worry about 1%.
I always backup browser profiles manually on top of sync.
But you can simply add the folder to onedrive backup.

TairikuOkami said:

Sync works 99% of the time, but you have to worry about 1%.
I always backup browser profiles manually on top of sync.
But you can simply add the folder to onedrive backup.

Code:

%LocalAppData%\Microsoft\Edge

Click to expand...

That's not enough, you need to backup the registry as well by exporting HKEY_CURRENT_USER\SOFTWARE\Microsoft\Edge\PreferenceMACs. I have a batch file that I run that backs up the edge localappdata and exports the registry values and I keep that on my C drive which gets backed up daily. So I have things covered from that point of view, and have my sync enabled for all three profiles. I was just hoping to get a 100% confirmation (not 99% ) for the future time where I lose all my profiles again. I was so lucky I had a restore point I could go back to. Maybe next time I won't.