I often like to create backups when testing the software I work on, and will sometimes create a differential backup if I want to be able to get back to multiple previous states. However, sometimes I realize that I forgot one thing I wanted to include in a differential backup, or I no longer need a previous differential backup. Sometimes I simply want to create a new scenario from the original base image and start working with a new series of differential backups. So I'd like to be able to delete some older differential backups so I don't get confused about which ones I'm using. But I can't find any way to delete just the differential backups, selectively or all at once.
Easiest way to do this, is to just script out the BACKUP and change the name of the file in the "TO DISK" option for each of the differential backups you want to save. e.g.:
Then, you can just delete the files on the file system as needed.
Where are you saving them to? It's really as simple as right-click/delete (or highlighting the ones that you don't want and hitting the delete key). They're just files in your file system.
Edited to add:
It sounds like you're only creating one backup set and under options you have it set to append to that backup set.
Instead you'll want to set your differentials and fulls for that matter, as their own backup sets without appending. Then it's a matter of simply deleting the differential files that it creates. Otherwise you'll have to create a maintenance plan, which isn't very conducive to one off backups.e
The best solution I've found so far is to remove the existing backup destination (so that the new backup won't overwrite it) and create a new one in a new file, then create a differential backup to that new file with the "back up to a new media set" option selected. But I currently don't understand this solution or even know if it works for sure (I haven't done a lot of backing up and restoring lately). How does it know what the base backup looks like if I've removed that file from the destination set?
I'm starting to think the best way to delete all my differential backups might actually be to skip all that and just restore to my base backup, then re-backup overwriting all existing backup sets. This method doesn't let me pick and choose which differential backups to delete, but at least I can understand what's going on and rely on it.