NAS sync - that's cool.
Since losing access to free enterprise "cloud" storage through work changes (company acquisitions), I had been chasing free storage for years and constantly moving platforms. With O365 it just works and the $99/year is so worth it.
With the NAS sync, if you have more than a single account data set, are you able to either nest accounts or use multiple accounts? We're nesting accounts now by sharing 2 other logins to the base account.