henry44
The backup share is NOT the relative location on your workstation drive eg you put C:\Backups
That location may be where the backup file is saved, but you need to create a windows networking share on your workstation, and use that name in the server manager panel
Depending what version of windows you are running, in Windows Explorer, right click on C:\Backups and select share, and create a share name eh Backups or something else.
Actually I would have thought you would already have specified that when you setup the original backup job, eg something like \\Backups or \\backupshare
Try using the sane setting you had in the backup job configuration, or create it again that & see how you go
The golden rule is to look in the log files on your sme server to see what is happening, or in your case it might show that a certain drive location cannot be found.
For starters look in the messages log file using server manager View log files option. You may need to look at other log files too, eg backup ones.