I'd recommend Sync.com with the free plan you can get up to 26gb free storage (With refferals) and everything is end to end encrypted so only you can see the files and not even Sync.com can. Other free options like Google Drive/OneDrive don't offer any kind of encryption.

Keep your data with multiple different cloud storage companies. As for bitwarden, I'd use at least 3 different providers and try to keep them in sync manually. If one ever goes bust then you always have the other as backup.

Pcloud or Icedrive or Filen will do.

Lol

I wouldn't be surprised if you have corrupted data on that 2011 drive. You want know until you try opening a file on there.

Just use cloud back up services. You won't really need to worry about your files once there in the cloud as the service provider looks after them for you.

I don't think this post belongs here.