Can't restore from Time Machine
Recently my MB Pro has begun to behave erratically (names in my Messages app are now only numbers, individual notes in the Notes app disappeared), so I tried to restore an earlier version from Time Machine. But RESTORE is greyed out. I've run Disk Utility on both my MBP and on my backup disk, and that didn't help.
Might updating to a newer operating system possibly help, or (if Ive been hacked) will it only compound the problem(s)?
Not sure what to try.
MacBook Pro 15″, macOS 10.14