Restic slice bounds out of range?

going to try it out next week how it goes, pretty scared that it fails because took almost 3 months for it to work again

after checking logs found this, i guess for some reason it was the pst?

error: file /media/servers/ad/shares/xxxr/xxx/Outlook/Outlook.pst: ReadFull returned negative number of bytes read: 4294967291
error: file /media/servers/ad/shares/xx/xxx/Outlook/archive.pst: ReadFull returned negative number of bytes read: 4294967291

Is the Outlook.pst opened in Outlook while restic tries to back it up?

sometimes they user leaves the computer, but didnt think that would make an issue leaving a file opened?