More choices for backup
+1 for WebDAV and OneDrive. S3/Backblaze would be pretty great too.
NextCloud backup would be appreciated. Also perhaps Backblaze.
pcloud integration would be nice to have, they are very helpful
OneDrive for Business
Not only this - if you want a backup you have to go with Google/Dropbox - but this are not the services I trust. So - I have no backup - bad situation.
iCloud and OneDrive would be top priorities. pCloud would be nice also. i don't use dropbox or google so it makes pro plan less appealing to not have native OS cloud supported.