This is the first Time Machine backup I've done after factory resetting laptop (Macbook pro 2019 Catalina 10.15.6).
The backup started off displaying a sensible amount of backup to run (e.g., "backing up 0 MB of 20 GB"). Then after hitting or getting close to that total, the backup size increased, i.e: Backing up 22.00 GB... Backing up 25.00 GB... and continues like this infinitely.
How can I solve this issue?