Why does an incremental system backup take so long?
I used to back up my various drives using either a disk backup or a file and folder backup. If there wasn't a lot to back up in an incremental backup, the incremental backup would be very quick. However now I have started backing up the main drive on my laptop using a system backup. Even if there is not a lot to back up since the previous backup of this drive, the incremental backup takes as long as a full backup, yet the incremental backup file it creates is small. Why are my incremental backups taking so long these days?