If you want a true archive that will last, a hard disc isn’t it. 10 years down the line you may find it won’t spin up at all, especially if sat unused.
Rewritable CDs/DVDs even aren’t terribly great as they die over time.
There are archive grade ones though.
Multiple copies of stuff is best, and keep checking them, or make fresh copies from time to time.
And, cloud storage also.
Amazon Glacier is designed for archiving. Low cost. Slow to extract, but the point is for archive, not rapid access.
Google as said, or there’s OneDrive, and if you have or may want Office, a 365 subscription gets you Office + 1TB of OneDrive storage. No limits to types of files, so fill it up with raw files etc. Some other cloud services can be limited to JPEGs and may even mess with your files to “optimise” them.
As a backup disc and for just one of those copies kicking around, most portable drives are fine. WD / Seagate are pretty good. I have my stuff in the cloud, on my desktop and backed up to my NAS (RAID array) which is itself backed up to a WD portable drive.
and reliability of drives in tests can be related to 24/7 use, which is very different from occasional backup and archive.