I had this working fine before I changed my C drive to an SSD. My subsequent scheduled daily or weekly backups are all working fine now because the amount of data needed to be backed up is relatively small (the addition of a few pictures or edited documents etc.) and so there will always be more than twice the space available on the backup drive. I just wish they’d explained it like this in the first place, it would have saved me a lot of time and maybe not alienated so many people who may have given up in frustration. In this way I successfully managed to backup 1.2 Tb of data onto a 1.81 Tb backup drive using WD Backup software. I clicked Backup Now again and the revised backup plan started and completed successfully as well.
I had 1810 - 848 = 962 Mb available which was more than twice the 616 Mb needed. This totalled 308 Mb which would require 2 x 308 = 616 Mb of space to be available on the backup drive. my Documents folder, Google Drive, One Drive and a few other folders. Then I edited the backup plan to include everything else I wanted to backup, e.g.
I clicked Backup Now and the backup started and completed successfully. According to the WD backup system this would need 2 x 848 = 1696 Mb of available space but I had 1810 Mb available so it ought to work. First I created a backup plan which only included my Pictures and Videos folders which together came to 848 Mb. I had a number of folders to backup and I decided not to try and back them all up in one go, but to back them up in stages. I formatted the drive again to ensure that it was empty and that I had 1.81 Tb available.
That’s how I read it initially anyway, but I was wrong.įirst I decided to check that there was nothing wrong with my backup hardware and so I formatted my 2 Tb My Passport Ultra backup drive and then tried backing up all my data (1.2 Tb) using Windows Backup instead of WD backup. What I read there implied that you would always need twice as much space on the target drive as you have files and folders to back up, and I thought that was ridiculous because if you had say 1 Tb of data to back up you’d need a minimum of a 2 Tb backup drive to do it and once the backup was completed you’d end up with a half empty drive that wouldn’t take any more backups.
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