In case you would, like me, be desperately upgrading your #Synology because #infosec after a while, be aware that when doing from DSM 7.2 to DSM 7.4, exFAT package goes away and is replaced by native exFAT implementation.
Which would be fine except previously key manager was able to mount keys stored on an unpartitioned USB key and not it isn't.
Do not test your backups, test your restores!